My waiver was approved - went to MEPS 6 weeks ago tomorrow. I will be swearing into the Air National Guard probably next week. Next hurdle - security clearance All my hard work, waiting, and persistence has paid off!
I wouldnt do intense things like P90X. Those are more geared toward people already in shape. If you want to improve your run/cardio without banging your legs on pavement, get onto an elliptical machine. It helped my run. I would switch between that and running on the street.