Just visit your local Dojangs(martial art schools). Find the most hardcore one with the most hardcore instuctors. Most you will find are full of little kids! However, if you search you will find an adult oriented, hardcore place to train. As far as, what style to join well, it all depends on...
It's all a bunch of crap!! Do not buy anything from Biotest. A note to all in regards to myostatin inhibition: Stay away from all myostatin products. It's a joke. Maybe in 10 or 15 years they will be able to inhibit myostatin but, right now it's just science fiction!
Jockboy,
You don't seem to want to find out any info on your own. I've seen you on other boards asking the same thing and everyone is telling you the same thing...Search first. You need to help yourself out and do some homework. What types of test?? All you answers are a search...