The Gofit Power Loops are an excellent way to strengthen and tone your lower body. The size of this exercise tool makes it a great "Go Anywhere, Train Anytime" tool. Comes with 3 latex loops and Core Performance Training Flip Book. The band resistances are approximately equal to 5lb (red), 10lb (blue) and 15lb (green) which provide multi levels of resistance to grow with your training needs. The included Core Performance Flip Book contains illustrated exercises developed by Mark Verstegen, founder of Athletes' Performance and trainer to Top Champions in Professional Sports.