Movements that occur in this plane involve rotation or horizontal movement, which include: Rotation: rotating the torso or a limb around its vertical axis (e.g., turning your head to the left or ...

Dr. Aaron Horschig, DPT, of Squat University has two hip rotation tests to determine your ideal stance.

These muscles work together to control arm movement and shoulder rotation. They also help keep the head of the upper arm bone, known as the humerus, in the socket of the shoulder blade, or scapula.

We'll discuss the function and anatomy. ... Many other muscles play a part in stabilizing and guiding the shoulder and its movements. ... Medial or internal rotation is holding your arm at your ...