Leg extension-leg curl combined TC321 is used for training the back and front parts of the hamstring – biceps flexor muscle and hamstring. The simulator is successfully used for rehabilitation purposes, is widely used in sports medicine, for the prevention of illness of the musculoskeletal system and is very effective for removing fat from both the back and front parts Stegna. The simulator allows adjustment of the support roller in the position of the lower part of the body and adjustment of the rotation of the power bar, which makes it possible to optimally adjust the simulator for proper and comfortable training.