Get Stronger Arms, Chest, and Shoulders at Home! The Adjustable Twister Arm Trainer is a compact and powerful strength training tool designed to target your forearms, chest, shoulders, and wrists. Made with a heavy-duty spring and ergonomic grips, this exerciser is perfect for home workouts, muscle building, and improving upper body strength. Whether you are a beginner or a fitness enthusiast, this adjustable power twister bar helps you tone muscles, increase endurance, and stay fit – all from the comfort of your home.