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.
The hip flexors (psoas) are the most important muscle for hip flexion (moving your leg forward). The most important muscle for extending your hip (moving your leg back) is the gluteus maximus. Both of these muscles obviously attach high on the hip and control the femur bone (upper thigh).