Running around a 'wall of death' could keep moon settlers fit

Lunar settlers could avoid health problems like muscle wasting by running on the inside of a circular wall to mimic the pull of Earth’s gravity on the body.

Future moon settlers could exercise by running around the inside of a circular wall – and just a few laps a day could counteract some of the negative effects of low lunar gravity.

The moon’s gravitational pull is about one-sixth as strong as that of Earth. This means lunar astronauts’ bodies support much less weight, and an extended stay would cause their muscles to atrophy and their bones to get less dense. Microgravity conditions also affect the way blood flows around the body, harming the cardiovascular system.