Attention: Do not pratice too fiercely ,but you should give off your energy evenly . Main Function : To train the muscles of the back. Operation Instructions: Sit on the adjusted cushion and the centrifugal movement model makes the down-pull natural.The fixed angled thigh cushions make it possible and easy for the user to do the movement and keep balance. PRODUCT SIZE:1650*1040*2030(MM) PACKING SIZE:1950*1480*500(MM) NET WEIGHT:146KG