PRACTICE MAKES PERFECT. The SKLZ Hit-A-Way trainer is the #1 selling softball swing trainer because of it's ability to help develop better swing and stance mechanics without ever having to chase a ball. The trainer easily attaches to any pole or tree with strong Velcro straps that can be fastened at any height. The tethered ball has a twist-back design that simulates a real pitch and can be hit up to 500 times per hour.