Why Do Astronauts Must Work Out On The International Space Station

The treadmill on the Worldwide Area Station, formally called the Treadmill Vibration Isolation System (TVIS), is just like every other one on Earth, except it is not linked to the station at all. It simply hovers around just like the astronauts. This has three advantages: The weight of the station itself is less, there's a reduction in vibrations and the treadmill moves with the astronaut. Crew members still must wear a harness and attach themselves to the treadmill; otherwise, their toes will simply push the machine away from them if they attempted to do any working.

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