xrazer,

there are two categories you may need to improve: biology and training technique

biology:
I have taken a few bottles of ConcenTrace colloidal minerals over the past few years, which helps out in numerous ways with basic health
along with this, it is necessary to expose myself to as much cold weather as possible (or cold water [cold shower] or sleeping without covers)

training:
I would recommend running(getting proper shoes, of course) short distances (100yards to 8miles) as fast as possible as much as possible, next in frequency only to cycling as exercise.
Also, it would be nice if you did some Bruce Lee Jeet Koon Do martial arts training (not the actual fighting, though).

Thanks,

Jacob