Abstract: The fluid filled neck exerciser includes an annulus filled with a fluid such as water and/or air and a head support device. The head support device has attachment members allowing the removable attachment of the annulus, the head support device including adjustment structure allowing adjustment of the size of the head support device for heads of differing sizes. The annulus may be selectively filled with a desired amount of fluid and with the device placed on the head of the user, the head may be rotated to perform exercises such as rehabilitation therapy or muscle development. The fluid filled neck exerciser provides exercise for the entire cervical musculature by movement in predetermined patterns.

Abstract: A neck developer capable of facilitating a complete neck exercise through frictionally-resisted pivotal movement on two axes. The neck developer is free-standing, and readily adjustable to trainees of different heights, head sizes, and strengths. The device permits neck exercise either through resisted pivotal movement on a horizontal first pivot axis effected, for example, by either side-to-side or front-to-back head motion depending upon the orientation of the trainee, through resisted pivotal movement effected by head twisting motion, or both.

Abstract: A portable training device for teaching football linemen the proper technique for raising their bodies to blocking positions when firing off the line. The training device includes a plurality of inverted U-shape spaced upright members and an adjustable set of overhead bars connected between each two upright members. The overhead bars limit the height to which a moving player can raise his body without hitting his head.

Abstract: A portable running rope device for practicing running an obstacle course having a supporting framework for supporting a plurality of criss-crossing ropes forming a latticework of running ropes which define spaces in which a runner is to place his feet during use. The framework includes a plurality of cross members with flexible ends to support the latticework of running ropes where the flexible ends yield to prevent injury in case the runner trips during practice.