A device for training and monitoring the respiratory system, comprising: - a main body defining: - an inhalation chamber and an exhalation chamber having respective external seats adapted to place the inhalation and exhalation chambers in fluid communication with an external environment; - a central chamber interposed between the inhalation chamber and the exhalation chamber - a mouthpiece associated with the central chamber and configured to be placed in fluid communication alternatively with the inhalation chamber or with the exhalation chamber through said central chamber; - a pair of one-way valves interposed between the central chamber and respectively the inhalation chamber and the exhalation chamber so as to enable the passage of an airflow from the external environment towards the mouthpiece solely through the inhalation chamber and from the mouthpiece to the external environment solely through the exhalation chamber; - a measurement sensor coupled to the main body and configured to independently measure a value representative of a user's breathing activity when said central chamber is placed in fluid communication with the inhalation chamber or with the exhalation chamber; - a control unit coupled to the measurement sensor in order to acquire said representative value; the device being characterized in that it comprises: - an adjustable load interposed between the mouthpiece and the central chamber, said adjustable load being operable in a plurality of load configurations each of which is adapted to determine a different resistance to the passage of air between the central chamber and the mouthpiece for performing both inhalation and exhalation exercises; - a main body defining: - an inhalation chamber and an exhalation chamber having respective external seats adapted to place the inhalation and exhalation chambers in fluid communication with an external environment; - a central chamber interposed between the inhalation chamber and the exhalation chamber - an inhalation chamber and an exhalation chamber having respective external seats adapted to place the inhalation and exhalation chambers in fluid communication with an external environment; - a central chamber interposed between the inhalation chamber and the exhalation chamber - a mouthpiece associated with the central chamber and configured to be placed in fluid communication alternatively with the inhalation chamber or with the exhalation chamber through said central chamber; - a pair of one-way valves interposed between the central chamber and respectively the inhalation chamber and the exhalation chamber so as to enable the passage of an airflow from the external environment towards the mouthpiece solely through the inhalation chamber and from the mouthpiece to the external environment solely through the exhalation chamber; - a measurement sensor coupled to the main body and configured to independently measure a value representative of a user's breathing activity when said central chamber is placed in fluid communication with the inhalation chamber or with the exhalation chamber; - a control unit coupled to the measurement sensor in order to acquire said representative value; - an adjustable load interposed between the mouthpiece and the central chamber, said adjustable load being operable in a plurality of load configurations each of which is adapted to determine a different resistance to the passage of air between the central chamber and the mouthpiece for performing both inhalation and exhalation exercises;