About ThisUseful for a huge variety of strength and toning exercises that target the legs, core, arms, and backPurple, extra heavy resistance has a range of 18 - 71 lbs., for those who are highly advanced exercisers who have mastered form and techniqueAdaptable, suitable for all levels of exerciserResistance exercise training aid for speed, agility, strength, power, running, football, basketball, baseball, soccer and all other athletic, fitness, weight, or cross trainingCost-effective and space-saving