Which of the following is NOT a plane of movement?

The correct answer identifies that "Horizontal" is not a recognized anatomical plane of movement. In the context of human movement and biomechanics, the major planes of movement are the sagittal, frontal, and transverse planes.

The sagittal plane divides the body into left and right segments, allowing movements such as flexion and extension. The frontal plane separates the body into anterior and posterior sections and is associated with movements side to side, like abduction and adduction. The transverse plane, on the other hand, creates a top and bottom division of the body and is involved in rotational movements.

While "horizontal" is often used colloquially to describe movements or positions (such as a horizontal exercise), it does not correspond to a specific anatomical plane recognized in the study of human movement. Therefore, it is essential to understand the distinction between the accepted anatomical terminology and more general descriptive language when analyzing movement patterns in activities such as Pilates.