STS105-E-5004 (10 August 2001) --- Astronaut Frank L. Culbertson Jr., on his way to the International Space Station (ISS) to serve as Expedition Three commander, exercises on a bicycle ergometer on the mid deck of the Space Shuttle Discovery. The image was recorded with a digital still camera.

During a visit to the Marshall Space Flight Center (MSFC), the Congressional House Committee on Science and Astronautics toured the S-IVB workshop. Pictured here are MSFC’s Dr. Wernher von Braun (standing) and Congressman Miller, Democratic representative of California (sitting on the ergometer bicycle) inside the workshop.

This is a wide-angle view of the Orbital Workshop lower level experiment area. In center foreground is the ergometer bicycle. In center background is a litter chair for the Human Vestibular Function experiment (Skylab Experiment M131) and in right background is the Lower Body Negative Pressure System experiment (Skylab Experiment M092). The ergometer bicycle was used for metabolic activity experiments and exercise. The purpose of the Human Vestibular (irner ear) Function experiment was to examine the effect of weightlessness on man's sensitivity and susceptibility to motion rotation, and his perception of orientation. The Lower Body Negative Pressure experiment investigated the relationship between the zero gravity environment and cardiovascular deconditioning. A characteristic of cardiovascular deconditoning is the partial failure of the blood vessels resulting in the excessive pooling of the blood in the legs when a person assumes an erect posture in a gravity field. The Marshall Space Flight Center had the program management responsibility for the development of Skylab hardware and experiments.

S117-E-07108 (12 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, exercises on a bicycle ergometer on the middeck of the Space Shuttle Atlantis while docked with the International Space Station.

STS073-355-003 (20 October - 5 November 1995) --- Doing her version of "Look, Ma, no hands" is astronaut Catherine G. Coleman. The STS-73 mission specialist works out on the bicycle ergometer on the flight deck of the Earth-orbiting Space Shuttle Columbia. Coleman was one of five NASA astronauts who were joined by two guest researchers for 16 days of in-space research in support of the United States Microgravity Laboratory (USML-2) mission.

S119-E-010204 (26 March 2009) --- Astronaut Steve Swanson, STS-119 mission specialist, exercises on a bicycle ergometer on the middeck of Space Shuttle Discovery.

S124-E-005447 (1 June 2008) --- Astronaut Karen Nyberg, STS-124 mission specialist, exercises on the bicycle ergometer on the middeck of Space Shuttle Discovery.

S126-E-007828 (16 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, exercises on the bicycle ergometer on the middeck of Space Shuttle Endeavour.

S117-E-06930 (10 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, exercises on a bicycle ergometer on the middeck of the Space Shuttle Atlantis.

S117-E-06927 (10 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, exercises on a bicycle ergometer on the middeck of the Space Shuttle Atlantis.

S73-20713 (1 March 1973) --- Astronaut Charles Conrad Jr., commander of the first manned Skylab mission, wipes perspiration from his face following an exercise session on the bicycle ergometer during Skylab training at Johnson Space Center. Conrad is in the work and experiments compartment of the crew quarters of the Skylab Orbital Workshop (OWS) trainer at JSC. In addition to being the prime exercise for the crewmen, the ergometer is also used for the vector-cardiogram test and the metabolic activity experiment. The bicycle ergometer produces measured workloads for use in determining man's metabolic effectiveness. Photo credit: NASA

S115-E-06786 (17 Sept. 2006) --- Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 mission specialist, works out on a bicycle ergometer on the middeck of the Space Shuttle Atlantis.

STS097-317-017 (30 Nov. - 11 Dec. 2000) Astronaut Joseph R. Tanner, STS-97 mission specialist, works out on the bicycle ergometer aboard the Space Shuttle Endeavour.

S127-E-007687 (22 July 2009) --- Astronaut Doug Hurley, STS-127 pilot, works out on the bicycle ergometer on Endeavour's mid deck during flight day 8 activities.

S125-E-009943 (18 May 2009) --- Astronaut Gregory C. Johnson, STS-125 pilot, exercises on the bicycle ergometer on the middeck of the Earth-orbiting Space Shuttle Atlantis.

S128-E-009694 (8 Sept. 2009) --- NASA astronaut Tim Kopra, STS-128 mission specialist, exercises on a bicycle ergometer on the middeck of Space Shuttle Discovery during flight day 12 activities.

ISS023-E-024113 (16 April 2010) --- NASA astronaut Stephanie Wilson, STS-131 mission specialist, prepares to exercise using a bicycle ergometer on the middeck of space shuttle Discovery while docked with the International Space Station.

S128-E-007154 (31 Aug. 2009) --- Astronaut Kevin Ford, STS-128 pilot, exercises on a bicycle ergometer on the middeck of the Space Shuttle Discovery while docked with the International Space Station.

S119-E-006665 (19 March 2009) --- Astronaut John Phillips, STS-119 mission specialist, exercises on a bicycle ergometer on the middeck of Space Shuttle Discovery while docked with the International Space Station.

STS112-329-022 (7-18 October 2002) --- Astronaut Sandra H. Magnus, STS-112 mission specialist, washes her hair near a bicycle ergometer on the middeck of the Space Shuttle Atlantis.

S126-E-008189 (19 Nov. 2008) --- Astronaut Eric Boe, STS-126 pilot, exercises on a bicycle ergometer on the middeck of Space Shuttle Endeavour while docked with the International Space Station.

S130-E-006532 (9 Feb. 2010) --- NASA astronaut Robert Behnken, STS-130 mission specialist, exercises on a bicycle ergometer on the middeck of space shuttle Endeavour during flight day two activities.

S128-E-006315 (29 Aug. 2009) --- Astronaut Rick Sturckow, STS-128 commander, gives a “thumbs-up” signal while exercising on a bicycle ergometer on the middeck of the Earth-orbiting Space Shuttle Discovery.

S100-E-5356 (25 April 2001) --- Astronaut Umberto Guidoni, STS-100 mission specialist representing the European Space Agency (ESA), works out on a bicycle ergometer on the middeck of the Space Shuttle Endeavour.

S131-E-009302 (12 April 2010) --- NASA astronaut James P. Dutton Jr., STS-131 pilot, exercises on a bicycle ergometer on the middeck of space shuttle Discovery while docked with the International Space Station.

S123-E-006485 (12 March 2008) --- Astronaut Mike Foreman, STS-123 mission specialist, exercises on a bicycle ergometer on the middeck of the Space Shuttle Endeavour while docked with the International Space Station.

S132-E-011612 (24 May 2010) --- NASA astronaut Michael Good, STS-132 mission specialist, exercises on a bicycle ergometer on the middeck of space shuttle Atlantis during flight day 11 activities.

S119-E-006696 (20 March 2009) --- Astronaut Joseph Acaba, STS-119 mission specialist, uses the bicycle ergometer on Discovery's mid deck to get some exercise.

S128-E-007788 (6 Sept. 2009) --- NASA astronaut Kevin Ford, STS-128 pilot, exercises on a bicycle ergometer on the middeck of Space Shuttle Discovery while docked with the International Space Station.

S96-E-5156 (02 June 1999)--- Astronaut Kent V. Rominger works out on the bicycle ergometer on Discovery. The photo was taken with an electronic still camera (ESC) at 02:23:46 GMT, June 2, 1999.

STS112-E-05901 (16 October 2002) --- Astronaut Sandra H. Magnus, STS-112 mission specialist, works out on a bicycle ergometer on the middeck of the Space Shuttle Atlantis.

S128-E-006460 (29 Aug. 2009) --- European Space Agency astronaut Christer Fuglesang, STS-128 mission specialist, exercises on a bicycle ergometer on the middeck of the Earth-orbiting Space Shuttle Discovery.

S129-E-006658 (18 Nov. 2009) --- Astronaut Randy Bresnik, STS-129 mission specialist, exercises on a bicycle ergometer on the middeck of Space Shuttle Atlantis during flight day three activities.

S114-E-6024 (1 August 2005) --- Astronaut Eileen M. Collins, STS-114 commander, works out on the bicycle ergometer on the Space Shuttle Discovery's middeck.

S122-E-011207 (18 Feb. 2008) --- Astronaut Stanley Love, STS-122 mission specialist, looks over procedures checklists while occupying the bicycle ergometer on the middeck of the Space Shuttle Atlantis.

S129-E-009888 (25 Nov. 2009) --- Astronaut Nicole Stott, STS-129 mission specialist, gets in a workout on the bicycle ergometer onboard the Earth-orbiting space shuttle Atlantis during flight day 10 activities.

This Skylab-2 onboard photograph shows astronaut Charles "Pete" Conrad exercising on a stationary bicycle (ergometer) used for monitoring the metabolism of the astronauts. The ergometer was used to conduct both Vectorcardiogram experiment (M093) and Metabolic Activity experiment (M171). Experiment M093 was a medical evaluation designed to monitor changes in astronauts' cardiovascular systems, while Experiment M171 was to measure astronauts' metabolic changes during long-duration space missions.

ISS002-E-5734 (23 March 2001) --- Astronaut James S. Voss, Expedition Two flight engineer, gives his arms and upper body a workout with the bicycle ergometer facility in the Zvezda Service Module aboard the International Space Station (ISS). The image was recorded with a digital still camera.

S89-E-5202 (25 Jan 1998) --- This Electronic Still Camera (ESC) image shows mission specialist, Bonnie J. Dunbar, payload commander, working out on the bicycle ergometer onboard the Earth-orbiting Space Shuttle Endeavour. This ESC view was taken on January 25, 1998, at 18:36:52 GMT.

S128-E-006313 (29 Aug. 2009) --- Astronaut Rick Sturckow, STS-128 commander, gives a “thumbs-up” signal while exercising on a bicycle ergometer on the middeck of the Earth-orbiting Space Shuttle Discovery. Astronaut Nicole Stott, mission specialist, is visible at right.

S133-E-006027 (25 Feb. 2011) --- Astronaut Michael Barratt, STS-133 mission specialist, works out on the bicycle ergometer on Discovery's middeck during flight day 2 activities. Photo credit: NASA or National Aeronautics and Space Administration

S85-E-5003 (7-19 August 1997) --- Astronaut Kent V. Rominger, pilot, works out on the bicycle ergometer on the Space Shuttle Discovery's mid-deck. Crew members devoted about 30 minutes each flight day to exercise on the bike. This view was taken with the Electronic Still Camera (ESC).

ISS020-E-023565 (23 July 2009) --- Astronaut Tim Kopra works out on the International Space Station's bicycle ergometer in the U.S. lab, Destiny. Kopra has only recently joined the Expedition 20 crew as a flight engineer, having arrived at the orbital outpost via the Space Shuttle Endeavour.

S128-E-007534 (4 Sept. 2009) ---- Astronaut Jose Hernandez, STS-128 mission specialist, works out on the bicycle ergometer on the middeck of the Space Shuttle Discovery. The shuttle is currently docked with the International Space Station while the STS-128 astronauts work with the Expedition 20 crewmembers aboard the orbital outpost.

STS077-365-010 (19-29 May 1996) --- Astronaut Daniel W. Bursch, mission specialist, works out on the bicycle ergometer on Space Shuttle Endeavour’s middeck. Bursch joined five other NASA astronauts for the Spacehab-4 mission - his third space flight.

S128-E-007532 (4 Sept. 2009) ---- Astronaut Kevin Ford, STS-128 pilot, works out on the bicycle ergometer on the middeck of the Space Shuttle Discovery. The shuttle is currently docked with the International Space Station while the STS-128 astronauts work with the Expedition 20 crewmembers aboard the orbital outpost.

S89-E-5246 (26 Jan 1998) --- This Electronic Still Camera (ESC) image shows astronaut Michael P. Anderson, mission specialist, exercising on the modified bicycle ergometer onboard the Space Shuttle Endeavour. This ESC view was taken on January 26, 1998, at 18:31:30 MET.

STS091-401-008 (2-12 June 1998) --- Astronaut Wendy B. Lawrence, mission specialist, pedals a bicycle ergometer onboard the Space Shuttle Discovery. Lawrence is making her third Space Shuttle flight and second mission to Russia's Mir space station.

STS056-13-004 (8-17 April 1993) --- Astronaut Kenneth D. Cockrell pedals the bicycle ergometer on Discovery's middeck. The mission specialist, along with four other NASA astronauts, spent nine days in space in support of the ATLAS 2 mission.

S123-E-006703 (16 March 2008) --- Japan Aerospace Exploration Agency (JAXA) astronaut Takao Doi, STS-123 mission specialist, exercises on a bicycle ergometer on the middeck of the Space Shuttle Endeavour while docked with the International Space Station.

S129-E-006489 (17 Nov. 2009) --- Astronauts Charles O. Hobaugh (bottom), STS-129 commander; and Mike Foreman, mission specialist, are pictured on the middeck of Space Shuttle Atlantis during flight day two activities. Hobaugh is exercising on a bicycle ergometer.

S114-E-6946 (4 August 2005) --- Astronaut Eileen M. Collins, STS-114 commander, works out on the bicycle ergometer on the Space Shuttle Discovery's middeck. Astronaut Charles J. Camarda, mission specialist, works along side Collins.

S88-E-5162 (12-08-98) --- Astronaut Robert D. Cabana, mission commander, works out on a bicycle ergometer on Endeavour's middeck. The photo was taken with an electronic still camera (ESC) at 22:25:24, Dec. 8.

This Skylab-3 onboard photograph shows Astronaut Allen Bean on the ergometer, breathing into the metabolic analyzer. Skylab's Metabolic Activity experiment (M171), a medical evaluation facility, was designed to measure astronauts' metabolic changes while on long-term space missions. The experiment obtained information on astronauts' physiological capabilities and limitations and provided data useful in the design of future spacecraft and work programs. Physiological responses to physical activity was deduced by analyzing inhaled and exhaled air, pulse rate, blood pressure, and other selected variables of the crew while they performed controlled amounts of physical work with a bicycle ergometer.

ISS042E082884 (12/27/2014) --- Expedition 42 Flight Engineer Terry Virts of NASA straps into the station’s stationary exercise bicycle known as the Cycle Ergometer with Vibration Isolation System (CEVIS). Each crew member spends an average of 2.5 hours a day exercising to combat the negative effects of prolonged weightlessness by maintaining bone and muscle mass and cardiovascular health.

S119-E-006712 (20 March 2009) --- Astronaut Tony Antonelli (left), Discovery pilot, almost appears to be saying "I've got next" as he hovers over an exercising astronaut Joseph Acaba. The STS-119 mission specialist is working out on the bicycle ergometer which the crew earlier deployed on the floor of Discovery's middeck. While Acaba goes outside the International Space Station on March 21 to participate in a spacewalk, Antonelli will remain inside to contribute support, along with other astronauts and a Russian cosmonaut.

S122-E-011220 (18 Feb. 2008) --- NASA astronaut Daniel Tani (left) and European Space Agency (ESA) astronaut Hans Schlegel, both STS-122 mission specialists, pose for a photo as they float on the middeck of Space Shuttle Atlantis. A beverage container floats freely in the foreground. The shuttle's bicycle ergometer is visible at bottom center.

STS109-E-5479 (7 March 2002)-- Astronaut Duane G. Carey, STS-109 pilot, takes a leisurely "spin" on the bicycle ergometer on the mid deck of the Space Shuttle Columbia, while waiting to assist Flight Day 7's assigned space walkers--astronaut James H. Newman and Michael J. Massimino. The extravehicular mobility unit (EMU) space suits of the two can be seen in the background. The image was recorded with a digital still camera.

STS046-24-025 (31 July-8 Aug. 1992) --- Astronaut Andrew M. Allen, STS-46 pilot, exercises on the bicycle ergometer device on the flight deck of the Space Shuttle Atlantis as it makes one of its 127 total orbits for the eight-day mission. Allen, equipped with sensors for monitoring his biological systems during the run, was joined by four other NASA astronauts and two European scientists on the mission.

STS050-21-035 (25 June- 9 July 1992) --- Astronaut Ellen S. Baker, mission specialist, works out on the bicycle ergometer on the mid-deck of the Earth-orbiting Space Shuttle Columbia. Baker was joined by four other astronauts and two scientists from the private sector for the record-setting 14-day United States Microgravity Laboratory 1 (USML-1) mission.

S119-E-006711 (20 March 2009) --- Astronaut Tony Antonelli (left), Discovery pilot, almost appears to be saying "I've got next" as he hovers over an exercising astronaut Joseph Acaba. The STS-119 mission specialist is working out on the bicycle ergometer which the crew earlier deployed on the floor of Discovery's middeck. While Acaba goes outside the International Space Station on March 21 to participate in a spacewalk, Antonelli will remain inside to contribute support, along with other astronauts and a Russian cosmonaut.

iss065e144326 (June 22, 2021) --- NASA astronaut and Expedition 65 Flight Engineer Mark Vande Hei sets up the International Space Station's exercise bicycle, also known as the Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS), inside the U.S. Destiny laboratory module. Vande Hei later strapped himself on the CEVIS and attached sensors to himself for a workout study measuring aerobic capacity in space.

S93-45371 (29 Sept 1993) --- Astride the bicycle ergometer, Martin J. (Marty) Fettman, DVM, breathes quietly into the cardiovascular re-breathing unit during the resting phase of an experiment. The payload specialist for the Spacelab Life Sciences (SLS-2) mission was participating with six NASA astronauts, also assigned to STS-58, for data collection and training.

STS-40 Payload Specialist Millie Hughes-Fulford conducts Spacelab Life Sciences 1 (SLS-1) Experiment No. 198, Pulmonary Function During Weightlessness, in JSC's Life Sciences Project Division (LSPD) SLS mockup located in the Bioengineering and Test Support Facility Bldg 36. Hughes-Fulford sets switches on Rack 8. Behind her in the center aisle are the stowed bicycle ergometer (foreground) and the body restraint system.

STS040-211-019 (5-14 June 1991) --- Astride the bicycle ergometer, astronaut Rhea Seddon, mission specialist, breathes into the cardiovascular re-breathing unit during the exercise phase of an experiment. The investigation, In-flight Study of Cardiovascular Deconditioning (Experiment 066), was developed by Dr. Leon E. Farhi of the State University of New York in Buffalo. It focuses on the deconditioning of the heart and lungs and changes in cardiopulmonary function that occur upon return to Earth. By using non-invasive techniques of prolonged expiration and re-breathing, investigators can determine the amount of blood pumped out of the heart (cardiac output), the ease with which blood flows through all the vessels (total peripheral resistance), oxygen used and carbon dioxide released by the body, and lung function and volume changes. Measurements are made both while crew members are resting and while they pedal the exercise bicycle, as Dr. Seddon is doing here. This scene was photographed with a 35mm camera.

This chart details Skylab's Vectorcardiogram experiment and facility, a medical study to measure the activity of the heart by recording electric signals (vectorcardiographic potentials) of each astronaut during preflight, inflight, and post-flight periods and obtain information on changes in heart functions induced by flight conditions. Vectorcardiograms were taken with a bicycle ergometer (part of Experiment M171) at regular intervals throughout the mission while the crewmen were at rest, and before, during, and after specific exercise periods. This instrument enabled an astronaut to exercise at selected levels of energy consumption. The Marshall Space Flight Center had program management responsibility for the development of Skylab hardware and experiments.

S73-34180 (7 Aug. 1973) --- A medium close-up view of astronaut Jack R. Lousma, Skylab 3 pilot, in the Lower Body Negative Pressure Device (LBNPD), as astronaut Alan L. Bean, commander, works around the leg band area. This portion of the LBNPD MO-92 experiment was televised on Aug. 7, 1973. The LBNPD experiment is to provide information concerning the time course of cardiovascular adaptation during flight, and to provide in-flight data for predicting the degree of orthostatic intolerence and impairment of physical capacity to be expected upon returning to Earth environment. The bicycle ergometer is in the background, partially visible behind Bean. Photo credit: NASA

STS081-E-5101 (12 Jan. 1997) --- Astronaut Jerry M. Linenger, mission specialist, works out on a bicycle ergometer device on the Space Shuttle Atlantis' flight deck as he readies for a long-duration stay in Earth-orbit. In mid-week, Linenger and his crew mates are scheduled to dock with Russia's Mir Space Station and pick up John E. Blaha, NASA astronaut who has been serving as a cosmonaut guest researcher since September 1996. Linenger will replace Blaha onboard Mir and the transfer will mark the second such direct exchange of cosmonaut guest researchers, though Linenger will be the fourth United States astronaut to spend a lengthy stay on Mir.

This chart details Skylab's Metabolic Activity experiment (M171), a medical evaluation facility designed to measure astronauts' metabolic changes while on long-term space missions. The experiment obtained information on astronauts' physiological capabilities and limitations and provided data useful in the design of future spacecraft and work programs. Physiological responses to physical activity was deduced by analyzing inhaled and exhaled air, pulse rate, blood pressure, and other selected variables of the crew while they performed controlled amounts of physical work with a bicycle ergometer. The Marshall Space Flight Center had program responsibility for the development of Skylab hardware and experiments.

STS088-307-036 (4-15 December 1998) --- Cosmonaut Sergei K. Krikalev, mission specialist, uses a bicycle ergometer to exercise his upper body on the busy middeck of the Earth-orbiting Space Shuttle Endeavour. Krikalev, named recently to serve on the first International Space Station (ISS) crew, is representing the Russian Space Agency (RSA). After devoting the major portion of its mission time to various tasks to ready the Russian-built FGB Module (Zarya) and the docked United States-built Unity Module (Node 1), the six-member crew released the tandem toward mission’s end.

SL3-108-1278 (July-September 1973) --- Scientist-astronaut Owen K. Garriott, science pilot of the Skylab 3 mission, lies in the Lower Body Negative Pressure Device in the work and experiments area of the Orbital Workshop (OWS) crew quarters of the Skylab space station cluster in Earth orbit. This picture was taken with a hand-held 35mm Nikon camera. Astronauts Garriott, Alan L. Bean and Jack R. Lousma remained with the Skylab space station in orbit for 59 days conducting numerous medical, scientific and technological experiments. The LBNPD (MO92) Experiment is to provide information concerning the time course of cardiovascular adaptation during flight, and to provide in-flight data for predicting the degree of orthostatic intolerance and impairment of physical capacity to be expected upon return to Earth environment. The bicycle ergometer is in the right foreground. Photo credit: NASA

STS071-102-027 (27 June - 7 July 1995) --- Onboard the Spacelab Science Module in the Space Shuttle Atlantis' cargo bay, four astronauts and a cosmonaut team up to collect data from Mir-18 crew members who have been aboard Russia's Mir Space Station for four months. Astronauts Ellen S. Baker (left), Gregory J. Harbaugh (top center) and Bonnie J. Dunbar, STS-71 mission specialists, are joined by astronaut Norman E. Thagard (right) and Vladimir N. Dezhurov (on bicycle ergometer) in the module. Dezhurov was Mir-18 commander and Thagard served as a cosmonaut researcher on the Mir-18 mission. The three STS-71 mission specialists lifted off aboard Atlantis on June 27, 1995, to participate in the historic link-up.

STS-40 Payload Specialist Millie Hughes-Fulford along with backup payload specialist Robert Ward Phillips familiarize themselves with Spacelab Life Sciences 1 (SLS-1) equipment. The two scientists are in JSC's Life Sciences Project Division (LSPD) SLS mockup located in the Bioengineering and Test Support Facility Bldg 36. Hughes-Fulford, in the center aisle, pulls equipment from an overhead stowage locker while Phillips, in the foreground, experiments with the baroreflex neck pressure chamber at Rack 11. The baroreflex collar will be used in conjuction with Experiment No. 022, Influence of Weightlessness Upon Human Autonomic Cardiovascular Control. Behind Phillips in the center aisle are body mass measurement device (BMMD) (foreground) and the stowed bicycle ergometer.

SL3-113-1586 (July-September 1973) --- This photograph is an illustration of the humorous side of the Skylab 3 crew. This dummy was left behind in the Skylab space station by the Skylab 3 crew to be found by the Skylab 4 crew. The dummy is dressed in a flight suit and placed in the Lower Body Negative Pressure Device. The name tag indicates that it represents Gerald P. Carr, Skylab 4 commander, in the background is a partial view of the dummy for William R. Pogue, Skylab 4 pilot, propped upon the bicycle ergometer. The dummy representing Edward G. Gibson, Skylab science pilot, was left in the waste compartment. Astronauts Alan L. Bean, Owen K. Garriott and Jack R. Lousma were the Skylab 3 crewmen. Photo credit: NASA

SL3-113-1587 (July-September 1973) --- This photograph is an illustration of the humorous side of the Skylab 3 crew. This dummy was left behind in the Skylab space station by the Skylab 3 crew to be found by the Skylab 4 crew. The dummy is dressed in a flight suit and propped upon the bicycle ergometer. The name tag indicated that it represents William R. Pogue, Skylab pilot. The dummy for Gerald P. Carr, Skylab 4 commander, was placed in the Lower Body Negative Pressure Device. The dummy representing Edward G. Gibson was left in the waste compartment. Astronauts Alan L. Bean, Owen K. Garriott and Jack R. Lousma were the Skylab 3 crewmen. Gibson is the Skylab 4 science pilot. Photo credit: NASA

S73-33858 (November 1973) --- A close-up view of the feet of scientist-astronaut William E. Thornton as he demonstrates the use of a treadmill-like exercise device which was developed for maintaining the leg and back muscles of the Skylab 4 crewman. Thornton is in the Skylab Orbital Workshop simulator in Building 5 at the Johnson Space Center. The Skylab 2 and Skylab 3 astronauts had no exercise device onboard capable of adequately maintaining their leg and back muscles. The treadmill device consists of a Teflon-coated aluminum plate or sheet bolted to the floor of the Skylab Orbital Workshop. The crewmen will wear the bicycle ergometer harness while exercising. Bungee cords attached to the floor and to the harness will supply the downward pressure or force for the back and leg muscles. The astronaut's feet will slide over the Teflon-coated plate as he "marches in place." Photo credit: NASA