SKLZ Fitness Pro Band Extra Heavy / BlackSKLZ Fitness Pro Band Extra Heavy Black At its core, all exercise involves resistance. The Pro Bands give you all the benefits of resistance, increased strength, flexibility, and stamina, in a portable size. Use them to warm up muscles and prime joints, for strength and flexibility training, and to help increase lateral speed and forward acceleration. FEATURES A portable and proven way to build upper and lower body strength Provides resistance to help