Which plane separates the body into anterior and posterior sections?

The correct choice is the frontal plane, which divides the body into anterior (front) and posterior (back) sections. This plane is oriented vertically and is crucial for various movements that involve side-to-side motions, such as lateral raises or side lunges. It enables trainers and fitness professionals to analyze movement patterns and postural alignment effectively.

In contrast, the transverse plane divides the body into upper and lower sections and is important for rotational movements, while the sagittal plane separates the body into left and right sections, often associated with forward and backward movements. The horizontal plane, often used synonymously with the transverse plane, refers to any plane that is parallel to the ground and divides the body into upper and lower parts. Understanding the function of the frontal plane is key for designing effective group fitness programs that address various movement patterns.