A swing is a whip: the big, slow parts of the body start it, each segment speeds up and then slows, handing its speed to the next one out, and the tip ends up far faster than any single muscle could move it. Pick a sport, change when each part pushes, and watch the physics answer.
The driver downswing on a full-body skeleton, from a real captured swing. Pick a common fault (upper body first, hips that don’t turn, casting, …) and see what it costs at the ball, and why hips first, club last is fastest.
Open →Forehand, two-handed backhand and forehand volley from real captured strokes: from the legs and hip turn through the shoulder and arm to the racket head, and where the ball goes.
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