Baji Quan: Extending one's full potential to the eight extremities
Baji Quan involves stretching out. The concept relies on applying one's head, shoulder, elbow, hand, bottom, crotch, knee and foot at once. It is manifested by "knocking the heaven down with a shoulder-shaking" strike, which extends one's full potential to the eight extremities. That's the origin of "Baji" (eight extremities).