The 175g Heavy Trainer slips over the grip and attaches to the throat of any tennis racquet, so there is no need for any additional equipment. A player trains with the racquet he or she is used to swinging. According to Laz Gates, CEO and inventor of the Heavy Trainer, “The goal of this product is to stretch out the muscles, build muscle memory you can’t get in a gym and increase racquet speed for bigger serves.”

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