Wall Balls Wall Balls are a functional training tool that is ideal for a variety of cardio, cross-functional fitness, and strength-building exercises. Thanks to the world of Cross Training they have become an incredibly popular training tool. Add some fun to your workouts with this versatile piece of equipment. Slams, side throws, wall balls, crunch throws and push-ups are just some of the exercises you can do with wall balls. As a result, you'll work your legs, bum, stomach, obliques, shoulders