Adjustable resistance training: This chest expander features five detachable springs, which can offer different resistance levels for workouts. It is suitable for both beginners and professionals. Ergonomic and nonslip handles: Designed with comfortable antislip grips, this arm exerciser provides a secure hold, ensuring better control and stability for effective chest, arm, and shoulder workouts. Durable and quality springs: Built with carbon steel springs, this stretch band resistance trainer maintains elasticity and durability, helping to increase upper body strength. Compact and portable design: Ideal for home, office, or gym workouts, this hand stretcher is lightweight and easy to carry, allowing you to exercise anywhere for improved muscle tone and endurance. Use scenarios: Home workouts: Use for a quick chest, arm, and shoulder routine, gradually increasing resistance as you get stronger. Office breaks: Perform short, focused sessions to relieve tension and maintain upper body conditioning during the day. Travel or onthego: Pack this lightweight exerciser in your bag to keep training regularly at the gym, hotel, or any workout space.