Compact progressive resistance trainer designed to build upper body strength, improve chest muscle definition, and fit into home or outdoor routines. Key benefits Progressive resistance for measurable gains: three length levels let you increase resistance as strength improves, supporting gradual and safe progression. Durable, professional spring design: high-carbon spring steel and stainless steel spring construction deliver reliable rebound and long service life. Safer, more effective chest activation: U-shaped structure distributes force evenly for consistent muscle engagement and reduced strain. Secure, comfortable handling: foam-coated, non-slip handles improve grip comfort and safety during repetitions. Portable and space-saving: lightweight and compact design enables workouts at home, outdoors, or in the park without bulky equipment. Who this is for Strength trainers and fitness enthusiasts seeking a portable tool for upper body conditioning. Men looking to refine upper limb muscle lines and chest shape. Users who need a compact, multi-level resistance option for home or outdoor workouts. Key features Multi-level resistance adjustment: three different lengths to match training stages and performance goals. Sturdy spring construction: professional spring rebound design for consistent resistance and durability. Scientific U-shaped frame: provides uniform force distribution for safer chest and hip strength training. Foam, non-slip handles: improve comfort and control during use. Portable size and light weight: easy to carry and store. Specifications Material: high-carbon spring steel, stainless steel spring, foam Size: 65-68CM (level 1, level 2, level 3 different lengths) Net weight: about 1.6KG Application: hip strength, chest muscle, abdominal muscle training Practical use scenarios Home circuit training: add 3 to 5 sets of chest squeezes and resisted rows between bodyweight exercises to improve upper body tone in short sessions. Park or outdoor workouts: carry the trainer in a small bag for chest and hip resistance exercises during outdoor routines or group meetups. Progressive strength programs: start with the shortest length for lower resistance, then switch to longer lengths as strength and endurance increase. Package contents Handle x 2 Spring x 2 Instruction manual x 1