The invention relates to gymnastic and exercise equipment and can be used for physical exercises to develop and strengthen body muscles, for carrying out sports events and in leisure activities. Said invention makes it possible to increase the durability of the training device, the elasticity of the surface thereof and to extend the possibilities for modifying the shape of training device as a result of its structure, comprising a pressurized torus-shaped sealed reinforced chamber which is provided with a flush-mounted valve and means for modifying the shape of the chamber. Said reinforced chamber consists of an internal hermetic chamber and multilayer textile reinforcement, located on screw line around hermetic internal chamber, wherein the coils of the textile reinforcement of adjacent layers are oppositely oriented with angle between coils of 30 to 150°, and of an outer sheath made of an elastic cloth.
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