Racquetball is great exercise—on earth. In space, it would be a whole new ball game, since the ball—and the players—would bounce off all the walls of the court. You'd need a special module in the space station just for racquetball, so the ball (and yourself) doesn't damage anything!

Someday, a space station may have a racquetball court, but today it's much too expensive. Especially when there are simpler ways to exercise. What is one?

Lift weights

Ride stationary bicycle

© The Children's Museum of Indianapolis, 1999