Abstract: Foot and leg exercise apparatus includes a pair of pedals pivoting on a base element. At the front of the base is a vertical post and a tee element telescopes relative to the vertical post. The post and the element include aligned apertures for adjusting the height of the tee element relative to the post. A pin is inserted into the desired aligned apertures in the post and tee element at the desired height. Tension springs are secured to the tee element and to the pedals for moving the pedals upwardly. The user's feet are disposed on the pedals and the user's feet and legs are exercised by pivoting the pedals against the tension springs. By adjusting the height of the tee element, the force of the tension springs may be varied. Sets of tension springs of varying strength may be used progressively. For forced exercise, a motor and cams may be used to move the pedals downwardly against the upward biasing force of the tension springs.

Abstract: Moldable golf club heads formed from a polypropylene plastic material encasing an elongated solid steel insert with a modulus of elasticity of approximately 30 million cycles per second and arranged with one end thereof extending one-eighth of an inch from the center of and substantially perpendicular to the striking face of the golf club head. The insert forms a part of the path for the shock wave produced when a ball having a resonant frequency of approximately 19 million cycles per second is struck by the head with the shock wave moving through the one-eighth of an inch of the plastic material, longitudinally through the insert to the head of the club and back the same path to point of impact whereby the density of the polypropylene and the insert being such that the recovery rate of flexure frequency of the head substantially equals the distortion frequency of the golf ball propelled from the club head.