Why we use Isometrics daily — Contraction and relaxation relationship: you can only contract a muscle as fast as the opposite can relax. . The front leg in the lunge, the hamstring is shortening (contracting) and the quad is lengthening/ relaxing to allow deeper range. This is the same in a wall sit. — The longer you hold or maintain contraction, the more muscles and motor units are recruited. Brain sends and receives lots of feedback (the shakes). —— Rapid relaxation and contraction is necessary to for speed, isometrics fine to the reflex and train both qualities at once. —— #rodwave #isometric #lunge #strengthtraining