Very often, we find that gaining strength and body mass can help dive deeper, because when we have bigger muscles we can generate more air in our body. Each muscles are fueled by oxygen, and the harder the muscle works, the more oxygen it requires. To dive deeper and longer, you need to make good use of this oxygen, and in order to do so , you and your body need to be very calm and relaxed. Relaxation helps considerably to be a good free diver, that way you can be more aware of the messages sent by your body, for example, spasm in the diaphragm are the first signals letting you know that you are running out of breath and therefore time for your ascension back to the surface. But when you control your mind
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