Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices using frictional force-resisters including a rope {or other flexible element} moving relative to the surface of elements
Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices using frictional force-resisters including a rope {or other flexible element} moving relative to the surface of elements