This includes one 1000g ball, one 500g ball, and one 250g ball

Use specific exercises to warm-up the shoulder prior to tennis

Strengthen your serving arm with upper-body ballistic movements

Underload and overload throwing has been scientifically proven to increase overhead power (like serving)

Using reverse throws targets muscles that get weak & tight from repetitive serving + forehands.

Improve serve technique through plyo ball constraint led drills

Use them before you play and add speed to your biggest weapon