Using DOUBLE CUBE Heavy Duty Resistance band is like having a workout partner whenever you need a little assistance as you work hard to progress. Learn a muscle-up or pull up faster, train for greater agility and endurance, and stretch in ways you couldn't otherwise. Power bands can be paired with common exercises to generate more resistance in workouts, enabling seasoned athletes to develop more muscle and strength. The closed-loop design is thin and lightweight, yet durable, and color coded for resistance levels from 10 lb. all the way up to 150 lb. Whether you’re ready for a new challenge, or a newcomer to the gym, DOUBLE CUBE bands are sure to improve your fitness.