Wall Balls are a functional training tool that are 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 into 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. arms. chest. back and lats.