Maximized performance and reliable durability - Maximized performance: This chest expander arm training device uses an internal and external dual-spring design to deliver even constant tension, smooth recoil, and enhanced rigidity and toughness. It resists deformation even after long-term use. - Stable and safe training: Features a unique triangular gold-colored support for improved stability. It is reinforced with multiple support points and incorporates a positive and negative double-triangle force structure to provide balanced resistance. - Safe and durable construction: Built with a thick carbon steel frame and reinforced steel processing to withstand higher loads and extend product life. - Improved grip and longevity: The non-slip grip offers secure handling and reduces slipping during sweaty workouts. Made with wear-resistant materials for longer use. Use scenarios - Scenario 1: At-home chest and upper-body workouts. Perform chest expansions, presses, flies, and rows to target chest, shoulders, and upper back. - Scenario 2: Arm and shoulder conditioning. Use for bicep curls, tricep extensions, lateral raises, and reverse fly movements to tone and strengthen the arms and shoulders. - Scenario 3: Warm-up and mobility routines. Integrate into shoulder mobility, scapular activation, and posture-focused movements to prepare the upper body for training. Specifications and materials - Frame material: Thick carbon steel - Spring mechanism: Internal and external dual-spring design - Support system: Triangular gold-colored support with multiple reinforced points and a positive/negative double-triangle structure - Grip: Non-slip, wear-resistant construction for secure handling during sweating sessions Notes - Designed to provide consistent resistance and durable performance across multiple exercises. - Suitable for basic to advanced upper-body training and routine warm-ups.