"About this product[Power Chest Expander] The portable pedal exerciser is lightweight and easy to carry and store. You can use the spring exerciser at home, in the office, in a hotel, at the gym or on the go, wherever you need it.[Adjustable Strength] There are five springs, each with a pulling force of 147N and a total pulling force of 735N. The number of springs can be increased or decreased according to the strength required by the individual to increase or decrease the strength of the force.[High-quality materials] The spring material is made of carbon steel, which has excellent elasticity, is durable, not easy to deform, and has a long service life. It has a steel coil pull rod and a non-slip PU handle. The handle and pedal are made of engineering plastics, which have high strength and good wear resistance, suitable for strength training at any level.[Multifunctional Strength Training] This is a professional tool for burning fat and building muscle. Strength training for different muscle areas, muscle stretching exercises for the chest, upper arms, buttocks, abdomen, stomach, feet, back and other upper body.[Ergonomic Design] The handle and foot buckle are ergonomically designed to provide a comfortable grip and effectively prevent hands and feet from sliding. You will not feel uncomfortable after long-term use. Improve muscle coordination, endurance and flexibility."