In this fitness machine, the counterweights are moved by means of rollers on a special frame, the “dumbbell”. The frame is guided on both sides in order to prevent tilting and excessively high load on one side during training. The chest and back muscles are trained by vertical tensile movements.

Smooth-running guidance systems play an important role in fitness training machines. The movement of weights should be precisely defined in order to give good training control and ensure the desired results. Irregular movements will disrupt the movement pattern and thus the training of the user.