Exercise device for running in place

A device for running in place exercises comprising:

• a flexible and essentially inextensible unitary tension rope rope of which one end is formed into a loop within which a person can exert a forward thrust on the loop, the tension rope having at its one end a holding device for removably affixing it to a fixed object for resisting tension,
• the free end of the loop portion of the rope being immovably but adjustably fastened to the standing part of the rope at the other end of the loop,
• the standing part of the rope extending beyond and away from the loop for a length sufficient to pass around a fixed object for resisting tension,
• the end of the rope having an enlargement, and a portion of the rope close to the enlargement lying in parallel contact with the standing portion of the rope,
• and a rigid helix of at least one and one half turns having a pitch resulting in a spacing between turns slightly greater than the rope diameter and an internal diameter slightly greater than twice the rope diameter,
• said helix surrounds the two adjacent portions of the loop portion of the rope and holds the rope against separation from a fixed object.