Im getting back in to mountain biking after a few years off. I use to race XC at the local level. I stopped because of a few serious injuries. What I want to know is if its really hard to come back to racing and being competitive after abut 4 years out of it? And if at 28 what my chances of turning pro might be. Im not looking for big time sponsorship just a few local sponsors to help pay the caust of racing.