ANSWER:
hamstring and gluteus
EXPLANATION:
While you run up to hit the ball, you take a final move, plant one foot and burden the other, drawing it backward for the stroke. The glutes and hamstrings, as well as the adductors, manage your hips. The hamstrings and quads flex and stretch your knees, and the plantar flexors flex your ankles. Your abs and lower back muscles support your trunk, and your deltoids adjust your shoulders square to the ball.
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