Adjustable ResistanceThe strength can be easily adjusted by adjusting the buckle, and the three-speed strength can be adjusted freely. Just adjusting the length, resistance can be adjusted Perfect Structural DesignThe twister arm exerciser features a sturdy steel construction that is padded for comfort. It works so well because of the dual action, spring flex technology which provides resistance in both directions, when you flex inward and lengthen out Complete Body Exercise Systemtone biceps & triceps, even thighs - Lift Bustline- Define shoulders & chest- Trim your waist line- Shape tights. This lightweight and portable training tool will allow you to build lean muscles without bulking Use for Anyone & AnywhereQuiet compact design makes it easy to carry and use virtually anywhere. It can be used by any age group, gender and those of all fitness levels to help achieve weight loss and muscle toning goals Get Lean & Fit Fastwith only a few minutes every day, this training tool will help you build muscle strength, tone your body, and lose weight. Lightweight and portable, you can pack it up and bring it with you anywhere