Astronauts at the International Space Station have to work out every day to keep themselves healthy. This means they exercise two hours per day on three different machines—a bike, a treadmill, and the so-called Advanced Restive Exercise Device, ARED—to prevent loss of bone density and muscle mass. On the ISS there is enough space for these machines, but what about the less roomy deep-space vehicles like the Orion Spacecraft, on which NASA wants to send astronauts on long journeys to the moon and Mars?
Clearly it has no earthly in-home use. It’s not even big enough to drape socks over, let alone the rest of the laundry.