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In its most simple form, it consists of swimming while held relatively stationary by a flexible restraining device, such as a harness or a foot restraint. This training method is used by a number of swim teams, such as the ones at Purdue University, University of Indianapolis, Florida State University and the University of Florida. Likewise, Special Forces Scuba Team members at Fort Bragg use a commercial restraining device in their personal training for open water swimming. Users often indicate that it takes a certain amount of time to learn to compensate for the feeling of swimming against a restraint. However, for those who have familiarized themselves with these systems, tethers enable the swimmer to swim at any speed, even flat-out sprints, and to vary the speed at will.
Tethered swimming, as this method is known, has been in use since the middle of the twentieth century, and has undergone a gradual evolution. Initially the swimmers were restrained by a rope, which was eventually supplanted by interlocked bicycle inner tubes or surgical tubing. Presently the systems in use employ either bungee cords or coiled lines to provide the shock-absorption necessary for a comfortable swim. Attachment methods also vary. Some devices restrain the swimmer by means of a belt, others wrap around the ankles, and still others connect to specially modified water shoes.