Abstract

Athletes often have injury from running methods. They are generally divided into two ways, which are kicking at the toes and pushing method with flat grounding. The latter seems to be safer with less injury. There are several important points for the background. They include forward leaning, instant weight removal operation, reaction power from the ground. Recently, unloaded squat exercise is effective for running training. Human seems to have three spheres, including head, chest, and pelvis. They show mutual connective relationship, where relaxed situation would be recommended for some rotation in three spheres and maintained intra-abdominal pressure (IAP).

Keywords: Forward leaning; Weight removal operation; Reaction force; Unloaded squat exercise; Intra-abdominal pressure (IAP)