During the phase of support, the foot is in contact with the enemy with the ground and maintains the body against the gravity. center of the mass body is normally in some place of the inferior zone of the abdomen between the hips. The support foot slightly touches the ground over the point that is directly underneath the center of the body of the mass. The joint of the knee is in its greater right extension before the phase of support. When contact with the ground becomes, the joint of the knee begins to flex, and in the measurement that flex is varied with style to run. styles to run with the rigid legs to reduce the flexion of the knee, and the loser, or more dynamic, running styles to increase it. As the support leg bends by the knee, pelvis falls downwards in the opposite side. These movements to absorb the blows and are against the coordinated action of several muscles. The pelvic inclination is the opposition of the tensile band of fascia lataeilio-tibial of the support leg, the abductor of the hip and abdominal and the muscles of the low back. The flexion of the knee is the opposition of the explanation [muscular contraction required] eccentric contraction of the muscle quadriceps. The support hip continues extending, and the center of the body of the mass happens over the support leg. The knee and soon begins to extend, and the opposed hip of its immersion rises shortly. The phase of support to the transition begins in the unit