Abstract: A modular unit for physical activities, outdoors, containing a multi-purpose structural metal frame mounted on a floor of a trailer on wheels, through a fixing point. The multi-purpose structural frame includes two vertical beams linked by longitudinal and transversal longitudinal rails with sliding guides to associate two structurally extendable modules mounted at the front and rear and in turn two horizontal storage cabinets; it is also arranged in a solid way by bolts for fixing both to the multi-purpose structural frame and to the floor of the trailer to a set of individual pulley unit module and to another set of double pulley unit module associated with a weight system with protective covers, and also includes a vertical storage cabinet integrally associated with the multipurpose structural frame.