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peak performance translated in actuality is,know how to use your lung properly, consider it a redundant BCD, when you inhale, tendency for you is to go up a little, when you exhale, go down a little, that I guess is what you should master, go dive more, instead of buying the book.
I've never seen the PADI DVD/CD for PPB, I did however take the class. I found the class to be of very little worth. Find yourself an experienced dive buddy who is willing to work with you, find a dive platform, and work trying to get and stay horizontal. This may involve removing weight, changing weight location, moving the BCD up/down, as well as moving the tank up/down. For me it involved removing my trim weights and that allows me to stay horizontal underwater. Once you figure out how to stay horizontal you can start working on the buoyancy itself.
Go dive. I took the course & it was a total waste of time & money. A great practice drill would be to take 3 hula hoops with different length ropes & 5 lb weights. Sink the hoops about 20 ft apart sink the first to 45 ft the second to 15 ft & the third to 30 ft. practice getting neutral at each hoop then swim through. Practice makes perfect.
What I do is link the hoops about 5 ft apart and 2-3 ft height difference on a chain and drop the chain in 15-20 ft of water. It's not easy controlling your buoyancy that shallow along with quick changes, especially in 7mm.
BTW, the buoyancy course I teach involves this and much more.
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I'm taking an AOW course at the community college this winter, even though I should have that rating before the class starts. (Cards do not equal skill/experience.) A number of people have said the instructor is good, and my own experience supports that. We'll have a lot of pool time, including sessions for buoyancy. Cost is about 90 for the class. Might be something to consider in place of the DVD (knowledge does not equal skill).
I do have a question to tack on to the thread. How can I feel manly when I go to the toy store to buy hula hoops?