[Retracted] Biomechanical Analysis of Touch Ball Movements in Tennis Forehand Strokes

Table 1

Correct actions when touching the ball.

Body parts	Body movement	Biomechanical effect	Action essentials
Legs	Fully extended	Promote the formation of angular momentum	Fully extended
Hip	Keep shoulders in line	Balance at the hips, upper body, and shoulders	Keep balance and turn fully
Upper body	Proper use of body parts; grip the racket tightly to prevent the hit point from straying from the sweet spot and creating a torque master in the reality	Correct use of the human body coordination chain, the racket head drives the ball to generate linear momentum and angular momentum	Grip not stiff; rhythmic and reasonable hitting
Head and shoulders	Keep head and shoulders in a straight line; shoulder drive arm rotation	Head and shoulder coordination for balance	Watch the ball