The Impulse IT arm curl is intended for gym & fitness studio use & works at strengthening the bicep muscles. The machine's design puts you in the right position to do the exercise without straining muscles, & the seat height & the position of the hand grips can be changed to suit each user. The 91kg (200lbs) weight stack provides resistance to match all levels of user. The arm curl has been made out of strong materials to withstand regular use, & the weights are located behind a protective screen to enhance safety.