Planes and Axes of Movement
Describing Movement in Three Dimensions
When a gymnast performs a forward roll, a discus thrower spins in a full circle, or a dancer executes a cartwheel, their body is moving through space in a precise, describable way. Movement analysts use a system of planes and axes to describe exactly which direction movement occurs and around which line the body rotates. Mastering this system is essential for analysing performance in physical activity and sport.
Imagine the body standing upright in the anatomical position — feet together, palms facing forwards. Picture three flat sheets of glass slicing through the body, each at right angles to the others. These are the three planes of movement. For every plane there is a matching axis: an imaginary rod passing through the body at right angles to that plane, forming the pivot line for rotation. Planes describe the direction of movement; axes describe the line around which rotation occurs.
There are three planes of movement — sagittal, frontal and transverse — each paired with a matching axis: the frontal axis (for sagittal plane movement), the sagittal axis (for frontal plane movement) and the vertical axis (for transverse plane movement). Each plane-and-axis pairing covers a different set of body movements.
The Sagittal Plane and Frontal Axis
The sagittal plane divides the body into left and right halves. Movement in the sagittal plane is forward and backward. Flexion and extension at any joint — bending the knee, extending the elbow, performing a bicep curl — all occur in the sagittal plane. Sporting skills that move primarily forward or backward include running, cycling, swimming freestyle and performing a squat.
Rotation in the sagittal plane occurs around the frontal axis (also called the transverse or mediolateral axis). This axis runs horizontally from left to right through the body. A gymnast performing a front or back somersault rotates around the frontal axis — the body travels forward or backward through the sagittal plane while spinning around this horizontal side-to-side rod. A tucked or piked somersault keeps the body close to the frontal axis, speeding up the rotation.
The Frontal Plane and Sagittal Axis
The frontal plane (also called the coronal plane) divides the body into front and back halves. Movement in the frontal plane is side to side. Abduction (moving a limb away from the midline) and adduction (bringing a limb back towards the midline) both occur in the frontal plane. Lateral jumping, sidesteps and star jumps all incorporate frontal plane movement.
Rotation in the frontal plane occurs around the sagittal axis (also called the anterior-posterior axis). This axis passes horizontally from front to back through the body. A gymnast performing a cartwheel rotates around the sagittal axis — the body tips sideways through the frontal plane. A skier leaning the body sideways into a carved turn also rotates about the sagittal axis.
The Transverse Plane and Vertical Axis
The transverse plane (also called the horizontal plane) divides the body into upper and lower halves. Movement in the transverse plane involves rotation around the long axis of the body — turning left or right. Medial and lateral rotation of joints, as well as whole-body spinning, occur in the transverse plane. Trunk rotation during a golf swing or a tennis forehand primarily occurs in the transverse plane.
Rotation in the transverse plane occurs around the vertical axis (also called the longitudinal axis). This axis passes vertically from head to toe. A trampolinist performing a full twist jump spins around the vertical axis as they rotate within the transverse plane. A figure skater pulling in their arms to spin faster is also rotating around the vertical axis.
The three pairings to memorise: sagittal plane + frontal axis (e.g. somersault); frontal plane + sagittal axis (e.g. cartwheel); transverse plane + vertical axis (e.g. full twist jump in trampolining, discus throw spin). The axis is always at right angles to its paired plane.
A common mistake is to name the axis and the plane with the same word — writing “the sagittal plane rotates around the sagittal axis.” This is wrong. Each plane is paired with an axis of the opposite name. The sagittal plane pairs with the frontal axis; the frontal plane pairs with the sagittal axis; the transverse plane pairs with the vertical axis. Think of it this way: the axis is always perpendicular (at 90°) to its plane — if you imagine the plane as a wall, the axis is a rod sticking straight through it. Because the axis passes through the plane at 90°, it runs in a different anatomical direction than the plane it is named for.
The discus throw is a good example of transverse plane movement around the vertical axis. The athlete begins with the whole body facing sideways, then rotates their entire trunk, hips and shoulders through approximately 360° in a horizontal direction before releasing the discus. This spinning motion occurs in the transverse plane (the body is turning left or right, not tipping forward/back or side to side) and rotates around the vertical axis (the imaginary rod from the top of the head down through the feet). The longer the athlete’s arms and the more effectively they hold the discus at the edge of that turning radius, the greater the release speed achieved.