It might not exactly be doctor's orders, but it made perfect sense to Josh Sweeney.
"If you hit somebody, you feel a lot better," he says, making his way off the ice from a grueling practice with the U.S. Paralympic Sled Hockey team — a sport also known as "murder ball on ice."
Sled hockey might be the fastest sport in the Paralympics; players strap on to a tiny sled perched a few inches off the ice, balanced on one double-runner skate. They use two short sticks like ski poles to fly across the ice. Then the sticks flip around, with a hockey blade on the tip.