Air which we breath enters the lungs through the?

air is sucked in through your nose or mouth. The air travels down your windpipe and into your lungs.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.