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Both.

Concentric: Exercise where the muscle is contracted under a load

Eccentric: Exercise where the muscle is stretched under a load.

So when you squat down its eccentric, when you come back up its concentric.

Most exercises are both, with a few exceptions (i.e. jumping of a wall is mainly eccentric, while a punch is mainly concentric.

Eccentric contraction is associated with increased muscle growth, but also DOMS (Delayed onset muscle soreness, when your muscles are very sore after a workout).

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16y ago

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