Designed To Tone Arms And Upper Body Ideal For Muscle Strengthening Used During An Aerobic Workout Will Help Increase Intensity And Calorie Burn. Can Be Used In A Variety Of Upper And Lower Body And Core Exercises For Overall Strengthening And Fitness Purposes That Will Improve Your Health , Strength And FitnessSimple Mechanism For Attaching The Weights On Axle Handle With Non-Slip Finish