Abstract: A lung and chest exerciser that arranges for some of the air expired from the lungs on an outbreath to be collected and then to be breathed back into the lungs on the next inbreath, together with some fresh air. By so arranging, the lungs have to open deeper or more often to receive an equivalent amount of fresh air. An embodiment of the invention may have a body, a collector bag, an adjustment slider, a filter and a nose-piece. The exerciser directly develops the lungs and the respiratory muscles and indirectly exercises the heart thereby affecting the body's metabolism, circulation and relaxation level.