The transverse plane divides your body into top and bottom halves, and all movements within it involve some form of rotation or twisting around a vertical axis. This includes spinal rotation, internal and external rotation of the limbs, horizontal abduction and adduction, pronation and supination of the forearm, and protraction and retraction of the shoulder blades. If a body part is spinning or twisting rather than bending forward/backward or tilting side to side, it’s moving in the transverse plane.
How the Transverse Plane Works
Picture a line running straight down from the top of your head through your spine to the floor. That’s the longitudinal (vertical) axis. Any movement that rotates around this axis falls in the transverse plane. The easiest way to visualize it: imagine you’re standing on a lazy Susan and someone spins you. Your body stays upright, but you rotate left or right. That spinning motion is pure transverse plane movement.
This plane is sometimes called the horizontal plane because it runs horizontally through the body at right angles to that vertical axis. When limbs rotate, they don’t literally follow the axis through your head, but they’re still classified as transverse plane movements because the rotation pattern is the same.
Spinal Rotation
Turning your trunk to the left or right is the most straightforward transverse plane movement. When you twist to look behind you, reach for a seatbelt, or swing a bat, your spine is rotating in this plane. Not all parts of your spine rotate equally, though. The upper thoracic spine (roughly your upper back near the base of the neck) allows about 39 degrees of rotation in each direction. That range drops steadily as you move down: the mid-back manages around 27 to 35 degrees, the lower thoracic spine about 18 to 19 degrees, and the lower lumbar spine contributes only about 6 to 7 degrees per side.
This means the bulk of your rotational motion comes from your upper and mid-back, not your lower back. Several muscle groups work together to produce trunk rotation. Your obliques (the muscles wrapping around the sides of your abdomen) are the primary drivers, with the external oblique on the opposite side of the rotation and the internal oblique on the same side firing together to produce the twist. Deeper muscles along the spine, including the multifidus and the transversus abdominis, also contribute by stabilizing individual vertebrae during the movement.
Internal and External Rotation
Your shoulder and hip joints are both multiplanar joints, meaning they move in all three planes. In the transverse plane specifically, they perform internal (medial) and external (lateral) rotation. Internal rotation turns the front of the limb toward the midline of your body, while external rotation turns it away.
At the shoulder, think of holding your arm out to the side with your elbow bent at 90 degrees. Rotating your hand downward toward the floor is internal rotation; rotating it upward toward the ceiling is external rotation. At the hip, the same principle applies. Sitting in a chair and swinging your foot outward (while keeping your knee still) is internal hip rotation. Swinging it inward is external rotation. These rotations are essential for throwing, swimming, kicking, and even walking with a natural gait.
Horizontal Abduction and Adduction
These are transverse plane movements that happen when your arm or leg is already elevated to roughly shoulder or hip height. Horizontal abduction moves the limb away from your body’s midline in the horizontal plane, while horizontal adduction moves it toward or across the midline.
The classic example at the shoulder is the reverse fly exercise: starting with your arms extended in front of you and sweeping them out to the sides. That’s horizontal abduction. The chest fly is the opposite, horizontal adduction, bringing your arms from out wide back together in front of your chest. At the hip, the seated hip abduction machine at the gym or the clamshell exercise both involve horizontal abduction of the femur (thighbone moving away from the midline in a horizontal orientation).
Pronation and Supination
These movements occur at the joints between the two bones of your forearm (the radius and ulna). Supination turns your palm to face upward, like holding a bowl of soup. Pronation turns your palm to face downward. The motion comes from the head of the radius bone rotating in a wheel-like fashion around the ulna.
You use pronation and supination constantly: turning a doorknob, using a screwdriver, pouring from a pitcher, or typing on a keyboard. Though these movements happen at the forearm rather than along the central vertical axis of the body, they’re still classified as transverse plane movements because they involve rotation of a body segment around its own longitudinal axis.
Protraction and Retraction
Protraction slides a structure forward and slightly outward, while retraction pulls it backward and slightly inward. The shoulder blades (scapulae) are the most common example. When you reach both arms forward as far as possible, rounding your upper back, your shoulder blades protract, spreading apart across your ribcage. When you squeeze your shoulder blades together (as in a rowing motion), they retract. The jaw also protracts and retracts: jutting your chin forward is protraction, pulling it back is retraction.
These movements don’t look like typical “rotation,” which is why people often overlook them as transverse plane actions. But because the scapulae glide along a curved ribcage in a primarily horizontal path, they fall within this plane.
Transverse Plane Movements in Sports
Nearly every powerful athletic movement relies on transverse plane rotation. A golf swing, a baseball bat swing, a tennis forehand, and a boxing hook all generate force by rotating the trunk and transferring that rotational energy through the arms. When a pitcher throws a fastball, the sequence involves hip rotation, trunk rotation, shoulder internal rotation, and forearm pronation, all transverse plane actions chained together.
This is why rotational core training matters for athletes and for everyday function. Your core muscles act as a “guy-wire” system, both producing rotational force and preventing excessive rotation that could injure the spine. Strengthening the obliques, deep spinal stabilizers, and hip rotators improves your ability to generate power in twisting movements while also protecting your lower back. Activities as simple as carrying groceries through a doorway or picking up a child from the side involve transverse plane control, making these movements relevant far beyond the gym or the playing field.