Whole body muscle training: The Twister Arm Trainer enables full body workouts that target arms (biceps/triceps), chest, shoulders, back, and legs. This compact device supports efficient, comprehensive exercise in home or on the go, helping you train multiple muscle groups in one session. Adjustable resistance levels: Three adjustable resistance levels are provided to help you adjust the intensity according to your fitness level and goals. Whether you are a beginner or an experienced athlete, you can your workouts to shape chest muscles, enhance arm contours, and improve performance. material: It is built with a strength metal spring for strong elasticity, durability, and stable, smooth movement. The outer layer of leather is reinforced with metal to help prevent injuries. The handle uses thickened antislip foam for a comfortable grip and control. Portable and detachable design: It weighs 3.5 lbs and collapses to 10 inches for easy backpack storage. It is easy to assemble and disassemble, making it suitable for home gym use or outdoor activities. You can use it outdoors, while traveling, in the office, or at home to maintain your muscles. Use scenarios: At home for a compact, full body routine in limited space; during travel or outdoor workouts for on the go conditioning; or in the office for quick muscle maintenance during breaks.