If you want a sport that puts you under a lot of pressure, try underwater diving. You can even feel some of the effects of pressure in a swimming pool. Down just a few feet underwater, your ears begin to hurt. That's caused by pressure on your eardrums. When you go underwater, however, you add the weight of the water to the atmospheric pressure.
Pressure also influences how divers use air.
The deeper you dive, the more quickly you use up the air in your tank. When you breathe compressed air through a regulator underwater, you ensure that the air spaces in your body are at the same pressure as the surrounding water. But if you breathe compressed air underwater and then ascend, holding your breath, the pressure around you decreases, so your lungs expand. Air sacs in your lungs could rupture, causing an air embolism , which means that bubbles of air enter your blood stream and block circulation to your brain. The longer you stay down and the deeper you go, the more nitrogen dissolves into your body tissues.