Use at any distance up to 100 yards.
This training device offers guaranteed safety - its cable will not break. Runner #1 runs half-speed which propels runner #2 into over speed. Runner #2 is able to maintain regular stride and good posture throughout. Runner #2 runs twice as far as #1. Includes secure cable.
Ratings & Reviews
Double trouble workout!
by JC Ridley -
We use this for both over-speed and resistance training. Highly recommended!