1. TRAINING EXPLOSIVE FORCE AND SPEED: Run faster, jump higher and dig harder with resistance Trainer that builds speed, strength, agility , flexibility,dynamic power and overall balance.Build strength and explosive force as you take your physical skill to the next level. 2. VERSATILE TRAINING: Ideal for all athletes and active people personal or team exercises to enhance leg, calf, back, chest, shoulder and core strength. Great for football players, runners, crossfit practitioners and basketball trainers. 3. SPEED & AGILITY RESISTANCE SET: up to 80 lbs resistance strength for applying resistance to agility and strength exercises. It is Original length 16.6 ft,9.8ft, 6.6ft Optional. The stretch cord can extend up to 3 times the original length. 4. BEST WAY TO USE:It is recommended that the athlete uses a partner to indeed make the process a challenge by applying the resistance.Individual training is also possible by connecting it to a stable grounded object.