Loading... Please wait...PowerMax Dual Speed Trainer. The two-person assisted overspeed and resistance running kit is very effective for speed gains. Uses 20’ of latex tubing that can be stretched to twice its length. The overspeed training provided to the rear athlete increases both stride length and frequency—key attributes to fast sprint speed. Includes 20’ latex tubing, two 3” wide hook & loop closure belts adjustable to 42” waist, carry bag, and instructions. Compatible with Max Belt, sold separately.