Abstract: A universal exercise machine comprising a belt portion (20), which is to be fixed as a conventional belt to the waist of the user. The belt portion (20) has on its upper and lower sides rings (40-56) for the attachment of elastic straps (22-30) which are connected to the hands, legs, and head of the user, for various exercises based on the application of force required for the stretching of the elastic straps. A distinguishing feature of the machine is the provision of an integrated back support (64), which may comprise a portion of the belt, or a part connected to the belt portion. The back support has a transverse rigidity greater than the remaining part of the belt portion (20). Another unique feature of the machine is the provision of floating elements (78a, 78b, . . . 78n) which imparts to the user buoyancy for exercising in the water.