Suitable for Variety of Exercise - The resistant band assists you in different exercises and is suitable for a variety of exercise including; P90x, CrossFit, Yoga, Insanity, Pilates, Hot Yoga, and Beach Body workouts. These loops come in three resistance levels (light, medium, and heavy). EASY TO USE AND CARRY: These resistant bands are portable and come with a black bag for you to carry them anywhere, be it to your home, gym or when you travel so you don’t miss your workout anywhere you go. Green = Light Resistance, Pink = Medium Resistance, Purple = Heavy Resistance Incredibly comfortable- use them with bare skin. Inner grip strips inside the bands keep them in place during every exercise