O.K.
I don't know how to start but the whole thread is funny.
First:
1. I am a COMPETITIVE BODYBUILDER.
2. Indeed I am drug-free (and I have bever taken drugs -even caffeine- when I was a competitive cyclist six years ago).
3. I partly believe that having too much muscle-mass is counterproductive in terms of optimal endurance performance (as freediving partly is).
4. I also think we know very little about the complexity of human biology and biochemistry, therefore I wouldn't be able to dive down to 30 m. with 92 Kg at a height of 1.80 cm (around 5.10 ft) and 13% body fat -which is pretty much a lean physique).
5. It has been said by someone that we need supplements as a good aid. My response is we need none if proper nutrition and rest are provided. Supplements are just anoter system to make certain humans very, very rich. Think for example of Joe Weider (Muscle & Fitness) or Bill Phillips (EAS & Muscle and Media magazine).
Actualy you don't even need vitamins or minerals if you eat the right produce (organically grown vegies and fruits in a rich non-depleted soil) and you live in the right environment: away from stress and pollution. As this hypothetical lifestyle is only achieved by few, I'd recommend a vitamin & mineral intake. The rest is crap and a waste of money.
Creatine will help you to get the extr rep or two in resistance training (nothing has been proven in endurance, and I think it does not offer anything positive in this area).
Tribulus terrestris is a waste of money, the same of the other concoctions I've read.
BTW the only stuff that works are the banned substances by the IOC (including HGH), which indeed are very popular amongst pro-athletes and which I do not favour since their use shows low-self esteem and/or excessive ambition regardless any ethical and health considerations.
On the other hand, the best way to keep your natural testosterone levels high is by regular practice of resistance training (weight training), a good diet, the right training (check
http://www.hardgainer.com/, http://www.cyberpump.com/index.shtml, and
http://www.ageless-athletes.com)
There are bodybuilders and strength trainees out there, who don't use any drugs, are well in their 50s, 60s, and 70s, and have better health and bodies that many teenagers.
I repeat regular weight training maintains your testosterone levels high, UNLESS YOU HAVE A THYROID DYSFUNCTION and which you need to check with your physican, then and only then the right medical treatment should be undertaken. So fijianfreediver think a little bit before doing something you might regret later on.
BTW I am authorised to give you all this information since I have been involved in sports since the age of five (I am currently 35 years old), I am an accredited personal trainer and strength conditioning coach, and currently study teaching and sports science in an Australian university.
I hope this information is useful for some of you guys.
Regards, gerard.