USTA Forehand & Backhand Biomechanics 2

Question 1

During the forehand swing, which plane of motion does trunk rotation primarily occur in?

Accepted Answer

Transverse plane

Answer

Trunk rotation during the forehand occurs primarily in the transverse (horizontal) plane as the torso rotates around the vertical axis.

Question 2

What is the primary role of the non-dominant arm during a two-handed backhand?

Accepted Answer

It counterbalances trunk rotation and contributes significantly to power

Answer

On the two-handed backhand the non-dominant arm drives rotation and contributes substantially to swing power while also counterbalancing the body.

Question 3

At contact on a topspin forehand, the racket face should ideally be oriented how relative to vertical?

Accepted Answer

Slightly closed (tilted forward ~5–10°)

Answer

A slightly closed racket face at contact, combined with low-to-high swing path, imparts topspin on the ball.

Question 4

Which muscle group is primarily responsible for internal shoulder rotation in the acceleration phase of a forehand groundstroke?

Accepted Answer

Pectoralis major and subscapularis

Answer

The pectoralis major and subscapularis drive internal shoulder rotation during the forward acceleration phase of the forehand.

Question 5

On a one-handed backhand, the hitting shoulder should be positioned how at contact to maximize power transfer?

Accepted Answer

Perpendicular to the net with hitting shoulder forward

Answer

A closed or semi-closed stance with the hitting shoulder rotating through and forward at contact maximizes kinetic chain transfer on the one-handed backhand.

(USTA) United States Tennis Association Certified Coach Practice Test

(USTA) United States Tennis Association Certified Coach Practice Test

USTA Forehand & Backhand Biomechanics 2