In which movement plane does trunk rotation occur?

Trunk rotation occurs in the transverse plane. This movement plane is also known as the horizontal plane and is characterized by movements that rotate along the vertical axis, allowing for actions like twisting. When the trunk rotates, such as during movements like swinging a bat or performing a golf swing, body parts move in this plane. The transverse plane divides the body into upper and lower sections and is critical for rotational movements.

In contrast, the sagittal plane divides the body into right and left sections and is associated with forward and backward movements, such as bending or extending. The frontal plane divides the body into front and back sections and involves movements such as side bending and lateral raises. Therefore, trunk rotation specifically aligns with the transverse plane, reaffirming the choice as the correct answer.