Training device (1) for exercising back muscles, in particular for conducting hyperextension exercises, comprehensive-a frame (2),a cushion attached to the frame (2), where the cushion (3) has an installation surface (11) for at least one part of the thigh area of a standing trainer,and where the installation surface (11) in the position of use of the training device is at an angle (a) unequal to the vertical (16) and 180's;so that the normal (15) on the installation surface (11) pointing away from the upholstery (3) is inclined downwards.
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