The SPEEDSTER Training System is a 3-phase complete speed and quickness training program. Phase 1: HEAVY RESISTANCE Phase 2: LIGHT RESISTANCE Phase 3: OVERSPEED TRAINING Heavy Resistance Training develops explosive starts while Light Resistance Training increases an athlete’s acceleration speed. Overspeed Training develops overall top sprint speed by increasing the function of the fast-twitch muscle fiber. Overspeed training will develop a longer stride length as well as a faster leg turnover rate. The Speedster Training Program is color-coded for easy-to-follow drills. This package comes with a 30’ Lightning Cord for Overspeed training that stretches up to 40 yards. It pulls the runner faster than their natural sprint speed. INCLUDES: The SPEEDSTER Dual Use Training Harness Torpedo Jet Sled 4 Weight Resistance Sand Bags (Sand not Included) 30ft Rocket Bungee with Safety SLeeve Technology Anchor Strap Colored Dome Markers (Imported) 2- Red, 2- Blue, 2- Yellow and 2- White Instruction Manual 4 Week SPEEDSTER Training Program