CONSIDER YOUR FITNESS to DIVE

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I agree.  Alcohol can also greatly impare your diving at depth even if the slightest bit is still in your blood stream and should not be practiced by any serious diver, no matter the depth.  Drinking too much, or even a little more than the norm before diving is not a practice recommended by any dive agency, ever.  Know your limits as well as your buddy's, and don't even come close to exceeding them.

As far as fitness goes; regular aerobic and anaerobic activity is great for the body.  I would also recommend books on the study/practice of Pranayama, or the "Yoga of breath."  That is one fantastic category of yoga that is recommended to many freedivers and can greatly extend bottom time.  I have read, and practiced many of its techniques and find its results fascinating.

Any more questions, just ask.

Raj