Doubleman Overspeed Trainer with Harness simply teaches proper running
form for both runners. Often times while running with resistance the
tendency is to lean forward. The Shoulder Harness keeps the body
“tall” throughout the run applying the pressure on the chest.
Includes: 1 Swivel Belt,
Choose 1: Swivel Belt, Medium H Harness, or Universal Shoulder Harness
Choose 1: 10, 15 or 20 foot long Slastix®, of Light, Medium, or Heavy