Expedition 67 Flight Engineers (from bottom) Bob Hines and Kjell Lindgren, both NASA astronauts, replace components on the advanced resistive exercise device (ARED) located inside the International Space Station's Tranquility module. The ARED mimics the inertial forces generated when lifting free weights on Earth allowing astronauts to maintain muscle strength and mass during long-term space missions.

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Photo credit: © NASA/piemags / Alamy / Afripics
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