SACH-SAWCH

flexion during extension. This is like billiards. Things deflect the energy and seldom add to it (iliopsoas only in hip flexion does that). Concentric muscle action costs the most energy. Cross bow fires. Eccentri c muscle action (being externally elongated while active) gets a free setting of the muscle to max. Setting cross bow to fire later. Isometric is between the other two in energy using some energy to not elongate by external pull.