The late, great tennis coach Welby Van Horn referred to it as the significant other arm. One look at this youngster and you figure he is well coached. The soa is not dangling or bobbing or pointing out towards the net.
Positioned across the body, it proves he’s been taught the importance of a significant shoulder turn as a key ingredient of the kinetic chain.
If you’ve not heard of the kinetic chain, that’s your homework.
Google it and you’ll understand how diminutive tennis players crush the ball and how 5’8″ Rory McIlroy blasts golf balls twenty yards past most of his playing partners.
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