Does anyone know a weight program that will help to obtain a more powerful one handed backhand?

Yoga, and core work, , using your own body weight. Concentrating on one side of the body with make the whole body out of alignment. Be very careful as the back bone come become curved, this is why certain yoag poses or core work will strengthen and align the body.

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www.kingarthurusa.com

If your question was for a 2 handed backhand, Agassi's advice might be crystal meth, a hair weave and imagine your dads face on the ball