Muscles and movement

Olympic diver, Tom Daley performs a handstand before diving
A handstand engages the muscles in isometric contraction.

Muscles contract when they work. If a muscle contracts to create movement, it is called an isotonic contraction.

An isotonic contraction can be concentric, which is where the muscle shortens as the fibres contract or eccentric, where the fibres contract as the muscle lengthens.

When a muscle contracts with no resulting movement, it is an isometric contraction.