The tennis swing trainer you hit live balls with

Most tennis training aids stop working the moment a real ball shows up. Prostrap is a tennis swing trainer you wear during live-ball practice. It tethers your wrist to your hip, so every forehand and backhand is pulled into the spacing, hip rotation and contact point the pros use.

Resistance cords load the whole kinetic chain, so power comes from your legs and core instead of your arm, and full-speed reps build muscle memory that holds up in matches. Players use it for a bigger forehand, a steadier backhand and heavier topspin; coaches use it to fix arming the ball and cramped contact in lessons and drills.