MULTIFUNCTIONAL ARM TRAINER: Each spring workout bar is wrapped with an elastic leather cover, which not only effectively reduces safety risks during exercise and prevents pinch injuries, but also significantly extends the service life of the spring, avoids rust, and brings you a more reliable and durable exercise experience. Arm Trainer with high resilience and no deformation. Long term use still has strong resistance. ARM TRAINER: Twister arm trainer regarded as powerful assistants for upper body muscle training. Whether it's the biceps, triceps, deltoids, pectoralis major, or even leg muscles, etc, they can all receive effective stimulation and exercise, helping you shape a solid, strong, and well-defined upper body.CHEST EXERCISER FOR MEN: Our twister arm trainer for men & women has a unique two-stage adjustment function and is equipped with 2 sets (4 spring workout bars) with different resistance, which can form 30/60/90/120 pound four stage resistance exercise. Easily meet your diverse exercise needs. From basic warm-up, rehabilitation therapy to advanced muscle shaping, our twister arm exercise set that meets all your needs. POWER TWISTER: You will receive 2 handles, 4 spring fitness bars, and 1 poster & instruction manual. We have a professional and caring product consultation service, always ready to help you solve problems. Allowing you to shop worry free and use our arm trainer set with confidence.TWISTER ARM TRAINER EQUIPMENT: Our carefully crafted poster that present every detail clearly, from the starting posture to the process of exerting force, guiding you to accurately master exercise movements. Detailed installation/adjustment instruction with clear steps. The two complement each other, making exercise smoother and more efficient. The detachable twister arm trainer is easy to store and carry, whether it's in the gym, office, or traveling, it won't delay the training process.