Reversibly installable modular fitness area comprising a plurality of platform-like islands adapted to support a plurality of systems and equipment in order to allow the user to carry out fitness exercises, said modular fitness area comprising at least one first central island; at least one second island (2 II); at least one third island (2 III); at least one fourth island (2 IV) at least one fifth island (2 V); at least one sixth island (2 VI); at least one seventh island (2 VII); at least one eighth island (2 VITI); at least one ninth island (2 IX); said islands having profile definable by any closed curve or polygonal form; said first island (2 I) comprising a structure shaped like a central tree in turn comprising a plurality of extensions that are branches from which one or more bars depart; said second island (2 II) supporting a plurality of handle-shaped gripping systems; said third island (2 III) comprising at least one bar for carrying out agility exercises; said fourth island (2 IV) comprising at least one bench, tilted or parallel with respect to the ground, like a bench adapted to allow abdominal exercises; said fifth island (2 V) comprising at least one system, preferably an oscillating platform, for carrying out balance exercises; said sixth island (2 VI) comprising at least one structure shaped like a smoothed rock with size such as to be able to receive the user even in extended configuration, and adapted for carrying out balance exercises; said seventh island (2 VII) comprising a plurality of rubberized mats, having a profile defined by any closed curve or polygonal form, in order to allow carrying out fitness exercises of various type; said eighth island (2 VIII) comprising at least one cube-like structure for carrying out fitness exercises; and said ninth island (2 IX) comprising a plurality of coupling systems shaped like centrally-intersected rigid arches, adapted to allow the connection of common elastic cords for carrying out traction exercises, said modular fitness area being characterized in that it comprises an energy supply system adapted to supply power to further components comprised in said fitness area, said energy supply system being represented by a plurality of photovoltaic modules shaped as movable leaves connected to the branches due to common ball joints which allow varying the spatial orientation of said movable leaves, said orientation of the movable leaves occurring manually or in an automated manner, said ball joints being connectable to an automated control system inside said central tree, said movable leaves also being situated with each at a corresponding grooved housing that can be found on the branches, each branch adapted to receive the corresponding movable leaf in retracted configuration, said movable leaves able to be spatially configured within the branches or outside said branches, said modular fitness area also being characterized in that it comprises a common system for detecting predefined threshold values, indicating the extent of atmospheric events such as rain, strong wind and hail, said detection system being adapted to signal the command of the retraction of the movable leaves within the corresponding grooved housings.