Isner has a great serve– he leans into his toss and then he springs up and out
get low
sometimes on the ground
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spring up and out
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tossing arm in
when the tossing arm comes down bring it onto your body– prevents opening shoulders up to soon
Etan Quinn
they brought in a mental coach “He’s done a phenomenal job. Ethan’s bought into that, and we just bare down on his routines and his
track it in
track the ball into the center of the racquet