The ultimate in water-resistance training, this aquatic exercise kit includes one-size-fits-most cuffs and Predator Fins made from soft rubber for strength and flexibility. They can be worn comfortably on the wrists or ankles for full-body conditioning. Each kit contains 2 cuffs and 4 finds in a mesh carrying case, plus detailed instructions for toning and strengthening legs and lower back, inner and outer thighs, arms, chest, and upper back.