You lower into the squat, pause at the bottom, then drive upward to stand; these three phases are called eccentric, isometric ...

Figure caption, Left: Concentric contraction - the biceps are ... eccentrically to lower the weights against resistance Isometric contraction – this involves a muscle producing tension but ...

Isotonic concentric contraction – this involves ... contracting eccentrically to lower the weights against resistance Isometric contraction – this involves a muscle producing tension but ...