Exercising apparatus for developing maximum force arm or leg blows

DETAILED DESCRIPTION I claim: 1.
An exercising machine for developing explicit muscles of an athlete for improving athletic ability, comprising in combination, force exerting means for restraining muscular movement of the athlete away from a staring posture during a forced exercise stroke by the athlete to produce a predetermined initial threshold external restraining force, force modifying means for removing the restraining force to free the athlete for substantially unrestrained movement away from the starting posture when the athlete overcomes the initial restraining force threshold thereby initiating substantially unimpeded movement away from the starting posture and spring actuated means for automatically reestablishing the initial threshold forces at the completion of said forced exercise stroke by the athlete.
2.
The exercising machine of claim 1 further comprising, a body attachment band for positioning about a movable extremity of the athlete, and a cord coupled to and between the body attachment band and the force exerting means.
3.
The exercising machine of claim 1 wherein said force exerting means and means for removing the restraining force further comprise two magnetic members, at least one being a magnet, held in an initial position with an air gap therebetween by a strong magnetic attraction field, and the force modifying means responsive to movement of the athlete from said starting posture removes the restraining force by separating the magnetic members to a further position substantially removing the magnetic attraction field between the magnetic members.
4.
The exercising machine of claim 3 further comprising adjusting means for varying the predetermined restraining force by variably inserting an air gap of adjustable distance between the two magnetic members.
5.
The exercising machine of claim 3 further comprising a cord of predetermined length adapted for movement by said athlete, a bobbin and accompanying mechanism carrying a portion of said length in coiled position in a normal position of the machine before movement of the cord by the athlete, and means responsive to removal of the restraining force by said release means for paying out said cord from the bobbin with movement of the athlete without substantial restraining force