Power Twister Adjustable Hydraulic Arm Training Device, 10-200kg, Black and RedOptimize your workout with the Twister Arm Trainer thanks to its flexibly adjustable resistance, ranging from 22 to 440 lbs and adjustable in 20 levels via a dial. This is ideal for strengthening your upper arm, back, triceps, shoulder, and chest muscles. This strength training machine utilizes a micro rebound mechanism that minimizes the risk of violent rebounds, ensuring safe use for smooth and controlled strength training. The arm exercise machine