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.
Muscles that perform hip extension are active when you stand up from a chair, walk, run, jump, roll over and climb stairs. They also play an important role in maintaining proper posture. Tightness or weakness can develop in these muscles, particularly if you spend a lot of time sitting during the day.