Axes of Rotation

An axis of rotation is an imaginary line around which the body (or part of the body) rotates. In AQA GCSE PE (spec 3.1.2), you need to know the three axes, understand how they relate to the three planes of movement, and be able to apply this knowledge to sporting examples. This lesson defines each axis, provides clear sporting examples, and explains the crucial plane-axis relationship.

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What Is an Axis of Rotation?

An axis is an imaginary straight line around which rotation occurs. When you spin, twist, or rotate any part of your body, that movement happens around an axis. Think of it like a skewer through the body — the body rotates around the skewer.

There are three axes of rotation, and each one is perpendicular (at right angles) to its corresponding plane of movement.

Axis	Direction	Corresponding Plane
Transverse (also called frontal or horizontal)	Runs from left to right (side to side) through the body	Sagittal plane
Sagittal (also called anteroposterior)	Runs from front to back through the body	Frontal plane
Longitudinal (also called vertical)	Runs from top to bottom (head to toe) through the body	Transverse plane

Exam Tip: The names can be confusing because the axis and its corresponding plane have different names. The transverse axis corresponds to the sagittal plane (not the transverse plane). This is the most common mistake students make — learn the pairings carefully.

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The Transverse Axis

The transverse axis runs from left to right (side to side) through the body, like a horizontal bar through your hips.

graph LR
    A["← Left"] --- B["Transverse Axis<br>(runs side to side)"] --- C["Right →"]
    style B fill:#4a90d9,color:#fff

Movements Around the Transverse Axis

Movements around the transverse axis occur in the sagittal plane — they are forward and backward rotations.

Movement	Sporting Example	Explanation
Forward somersault	Gymnastics, diving, trampolining	The body rotates forward around an imaginary bar running through the hips
Backward somersault	Gymnastics, diving	The body rotates backward around the same axis
Flexion / extension at a joint	Running (knee), kicking (hip), bicep curl (elbow)	The limb rotates forward/backward around the transverse axis of the joint

How to visualise it: Imagine a horizontal bar running through your hips from left to right. Now imagine somersaulting forward — you are rotating around that bar. That bar is the transverse axis.

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The Sagittal Axis

The sagittal axis runs from front to back through the body, like a horizontal arrow pointing straight ahead from your belly button through to your spine.

graph LR
    A["← Front"] --- B["Sagittal Axis<br>(runs front to back)"] --- C["Back →"]
    style B fill:#e74c3c,color:#fff

Movements Around the Sagittal Axis

Movements around the sagittal axis occur in the frontal plane — they are side-to-side rotations.

Movement	Sporting Example	Explanation
Cartwheel	Gymnastics	The body rotates sideways around an axis running front-to-back
Star jump (abduction/adduction)	Fitness, warm-up	Arms and legs move sideways, rotating around the sagittal axis of each joint
Lateral flexion	Avoiding a tackle, leaning in cycling	The torso bends sideways around the sagittal axis of the spine
Goalkeeper dive	Football	The body moves sideways

How to visualise it: Imagine a horizontal rod running through your stomach from front to back. Now imagine doing a cartwheel — you are rotating sideways around that rod. That rod is the sagittal axis.

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The Longitudinal Axis

The longitudinal axis runs from top to bottom (head to toe) through the body, like a vertical pole from the top of your head down through your feet.

graph TD
    A["Top ↓<br>(Head)"] --- B["Longitudinal Axis<br>(runs top to bottom)"] --- C["↓ Bottom<br>(Feet)"]
    style B fill:#9b59b6,color:#fff

Movements Around the Longitudinal Axis

Movements around the longitudinal axis occur in the transverse plane — they are rotational (twisting) movements.

Movement	Sporting Example	Explanation
Spinning (full turn)	Ice skating spin, ballet pirouette	The body rotates around its vertical axis
Twisting	Discus throw (trunk rotation)	The trunk rotates around the longitudinal axis
Golf swing rotation	Golf	The torso twists around the spine (longitudinal axis)
Pirouette	Dance, figure skating	The whole body spins around the vertical axis

How to visualise it: Imagine a vertical pole running from the top of your head down to your feet. Now imagine spinning on the spot like an ice skater — you are rotating around that vertical pole. That pole is the longitudinal axis.

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The Plane-Axis Relationship

This is the most important concept in this lesson. Every movement occurs in a plane and around an axis. The axis is always perpendicular (at 90°) to its corresponding plane.