Mike Hamer
Green Belt
While not formal BJJ training, I started training in IRT (which does cover alot of groundwork) when I was 18.
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Good luck with that. Here's an article I found doing a quick google search: http://www.totalhealthbreakthroughs.com/2009/01/if-i-had-to-pick-just-one…/
I also posted about this on my blog. It's a great topic. I quoted your original post in this thread and used my first response as the core for my blog post. I hope you don't mind. If you do, let me know.
http://www.stevebjj.com/2009/08/dont-let-be-your-excuse.html