This app will give you insights into how your lungs are working!! This is a simple tool but powerful to do exercise of lung and breath. This is a simple exercise to check how much you can hold the fresh air into your lungs. It will show the oxygen, lung healthiness and lung capacity. ★ Totally Free of cost!! ★ Start testing your oxygen holding capacity ★ Do the regular exercise ★Take necessary steps if you can't hold the targeted fresh air into the lungs Do this exercise regularly and i