Muscle Actions: Extension

Extension refers to a movement that increases the angle between two body parts or the straightening of a joint.

Extension Exercise Examples:

Extension of the knee.

Picture a person sitting on a chair. As they flex their leg and straighten it, their heel moves further away from their hip…

The leg extension machine pictured here is a perfect example of the extension muscle action.

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Shoulder Extension – Arm moves straight behind body.
Triceps Kickback – Extension at the elbow occurs via the triceps resulting in an increase in the angle between the ulna and the humerus. Your wrist moves away from your shoulder.
Glute Bridge – Hip extension
Back Extension – a common core exercise

When it comes to the foot, terminology changes. Just to confuse you.

The term and extension is dropped.

Instead extension and flexion of the foot is referred to as plantar flexion and dorsiflexion.

I don’t know why. It’s just the way it is.

The opposite movement of extension is flexion.

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