This WearBands Training System comes with 5 resistance levels compatible with anyone of any size or fitness level. Resistance training allows for greater levels of resistance the more the band is stretched. WearBands deliver completely unrestricted, no-impact dynamic resistance to any activity or workout of your choice with no limitations. By simply adding WearBands to your favorite workout or activity, you will activate more muscles for a longer period of time, resulting in more strength and physique gains, more calories burned (over 30%), and more cardio benefits in less workout time. Lightweight and portable, they can be used anywhere; at home, outdoors, at the gym, in a class, and while traveling.