one of the ways to preset the loose wrist action is to put the racquet face to the sky on the preparation–bonus Raonic gathers with the ball on the side of the racquet
coil
on the serve start coil the body
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racquet face to the sky
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non hitting hand
keep the non hitting hand on the racquet during the rotation
spring up
use your legs to spring up and into the court on the serve
big deep
racquet to the ground