UPGRADE REBOUND CORE ROLLER WHEEL: Time to use the Abs roller to level up your core and abs training! Dual roller design with non-slip handle, sweat-absorbent sponge, provides nonslip and comfortable grip. Built in strong springs rebounding device, more sturdy and safe to use. Compact and portable, you can do your workout at home, office, bedroom, living room, and no limitation for you. UPPER BODY MUSCLE TRAINING: The Abs roller is more like a comprehensive upper body trainer, different motion range can effectively train different part of muscles and also suitable for people with different training needs. Through the back and forth motion, you can effective train the muscles on arm, shoulder, chest, the whole back and core, one abs roller can meets your plan for upper body training.