The phrase "concentric phase" refers to the part of a movement or exercise where your muscles contract and shorten. It is the phase when you are actively lifting or pushing against resistance, like when you raise a weight during a bicep curl.
Sentences with «concentric phase»
Avoid performing a back extension during the upward concentric phase of the squat. (onnit.com)
This phase appears as a break, and the shorter it is, the more strongly and effectively the contraction of the muscle will happen; — explosive concentric phase, in which the muscle shortens. (fitnessandpower.com)
The upward concentric phase is essentially a simple motion in which you stand up, so that you end up where you started. (onnit.com)