Abstract: A dummy for practicing cardiopulmonary resuscitation (CPR) of a human being has a simulation of the thorax in the form of a torso, a head simulation and a trachea/lungs simulation in the form of a bag. The thorax simulation formed by the torso is made of an elastically compressively deformable foam and further includes a chest plate accommodated under the chest side of the torso. The back of the torso is shaped to provide support bodies, such that compressive deformation of the foam of the torso and flexural deformation of the chest plate upon compression in the context of cardiac massage jointly simulate the natural deformation of a human thorax. That design can allow the dummy to be economically produced in spite of a realistic simulation and natural deformation characteristics.