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and the reason you want to get 'certified' (maybe thats what your askng?)
There are a few things your body needs to be able to handle. A good heart, good lungs, no 'bad ears' - tubes, holes.. and no earplugs!
Some people are not really comfortable at first- breathing under water. Its not normal, so to speak, so being trained in a pool for a few hours before going to the bottom of the ocean is a good idea.
Its a good idea to a certified diver that hasnt dove in the last month too!
to the point... there are a few things to know about breathing compressed air while under pressures greater than 1 ATA. Maximum depth, bottom time, surface intervals, nitrogen narcosis....
Just go take a class. You will probably need to purchase a mask, fins, and a snorkle to start with. I reccomend waiting untill you know wha your looking for there.
You will learn lots in class.
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