Knickerbocker's theory emphasizes on the interdependence of major players in the same industry. Imitation is the name of the game where firms try to match each other's moves to keep each other in check so as not to allow a rival gain a competitive advantage over others.
hamstrings. extend the hip and flex the knee against resistance and are important knee stabilizers. help control hip flexion in weightbearing position by contracting eccentrically when the flexion occurs in same direction as gravity as dead lift or hip=hinge position.
Hip Flexor Stretch. In order to stretch the hip flexors, you must perform the opposite joint action. Since the hip flexors bend the body forward at the hip, you must keep your body straight as you bend it backward. To stretch the hip flexors, try a variation of the low lunge.