Why it rocks: “This is extra tough on the core because the medicine ball throws off our stability,” says Newton. “This is primarily working the core, but also benefits the upper body ...

Don't know what to do with that medicine ball? Here are 23 of the best medicine ball exercises from a trainer to strengthen ...

Eleven-year-old Hayden Thomas enjoys playing tennis with his sister Madilynn. He can even serve the ball, thanks in part to a ...