U-shaped three-position adjustable arm strengthener

Overview
Three-level adjustable resistance: Customizable intensity settings for progressive strength training
U-shaped spring design: Ergonomically contoured for comfortable grip and efficient force distribution
Compact indoor fitness equipment: Space-saving solution for home or gym upper body workouts
Targeted muscle engagement: Effectively trains pectoral, bicep, and arm muscles through flexion exercises

Specifications
Type: Spring-type arm strength trainer
Resistance Range: 20-40kg (black-blue variant), 30-50kg (black-red variant)
Material: Steel spring with foam grip handles
Product Dimensions: Approximately 50cm length (based on visual estimation from product images)
Weight Capacity: Designed to withstand repeated flexion within specified resistance ranges

Packing List
Arm strength trainer*1