« I thought a longer plank meant a stronger core »: why hips that sink during the hold are a warning signal your lower back wants you to take seriously
That sagging hip during your plank isn’t a minor form slip—it’s your lower back warning you that the load has shifted to the wrong tissues. New research challenges the myth that longer plank holds build better stability, and biomechanics experts now recommend shorter, perfect repetitions over grinding endurance tests.