It turns out tennis balls are a handy addition to the at-home ... The friction created between the felt and the wall can help ...

Last week at the Barcelona Open, the cameras rolled as a ball boy suffered a painful interaction with the back wall. All seemed to be going according to plan, until suddenly, it was not ...

I use the tennis balls for my left back muscle to loosen up the muscle by standing against the wall and moving the ball with the muscle," says a reviewer. "Don't know about tennis, but they're ...