Add multi-directional resistance or assistance to sprints, crawls, shuffles, jumps as well as overspeed and HIIT workouts to increase leg power and speed. Used on its own or with other agility tools like the Speed Ladder or Quick Cones, this resistance trainer also develops cardiovascular endurance and athletic agility while teaching proper running form including arm drive, forward lean and knee drive. Comes with 10 instructional drill cards. DESIGN: Strengthen fast-twitch muscles for short bursts of strength or speed Provides progressive resistance for athletes of all fitness levels Increase explosiveness by challenging glutes, quads, hamstrings and calves Partner safety strap to control resistance level Adjustable belt with free slid ring for movement in any direction