How will I know? I asked.
Your foot will tell you, was the reply.
Not eccentricity as in weird behaviour, or doing stuff that’s considered out of the norm… although clearly peddling backwards at max output on a stationary bicycle may well be regarded by most as being rather strange… But eccentricity as in eccentric (pronounced eee-sen-trik) exercise, the scientific term given to how muscles behave when you lengthen them, as opposed to concentric exercise, when you shorten them.
For example, when you lift a weight, your bicep undergoes a concentric contraction – it shortens. When you slowly release that weight and straighten your arm, your bicep lengthens and go through an eccentric contraction. It does this because of an opposing force that’s greater than the muscle generates.