Astronaut Paul J. Weitz, pilot for the first manned Skylab mission, prepares to check out the bicycle ergometer in the work and experiments area of the crew quarters of the Skylab Orbital Workshop (OWS) trainer during Skylab training at the Johnson Space Center. Scientist-Astronaut Joseph P. Kerwin, science pilot of the mission, is in the background.
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Taken on 1 March 1973, 11:56
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nasacommons/7678547976/">Cycling in Space</a>