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SESK: Stuff Everyone Should Know · sesk.info/aero-microgravity-daily-exercise

Why do astronauts exercise about two hours daily?

To limit muscle and bone loss in microgravity.

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  1. To steer the station
  2. To make artificial sunlight
  3. To protect muscles and bones ✔

Why: In microgravity, muscles and weight-bearing bones do less work and can weaken. Regular resistance and aerobic exercise helps astronauts reduce those losses.

Huh, didn't know that: Station exercise equipment includes a treadmill, cycle, and resistance machine.

The dad joke
Astronaut workouts are out of this world, but the treadmill stays inside.
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References

Answer: To protect muscles and bones. In microgravity, muscles and weight-bearing bones do less work and can weaken. Regular resistance and aerobic exercise helps astronauts reduce those losses.

  1. NASA, Astronaut Exercise www.nasa.gov/general/astronaut-exercise
    Early on, scientists realized that exercise is a critical part of maintaining healthy bones and muscles in space, just as it is on Earth.
    Checked 2026-10-10.

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