Resistive Exercise Bands can perform many planes of movements without any restriction. Resistive Exercise Bands provide resistance in both the eccentric and concentric phase of muscular contraction. Resistive Exercise Bands can adhere to whatever they are attached to because they conform to the any attachment surface. Tremendous training advantage when attaching them to your body for speed training, polymeric or reactive strength training drills. No need to deal with a separate belt or harness which increase set-up time, transition time and cost. For anyone who needs a way to work out on vacation, can't get access to a gym, or wants something extra to add to the workout, resistance bands are well worth.