If you head over to http://www.pbfit.co.uk/ there is plenty of useful information on there to increase your sprinting performance, It is ran by a paintballer who is a professional personnel trainer, he knows his stuff! To get the most power out of your body you could just do the interval or "sprint" training but there are far more efficient ways of doing this listed on this website, that you can do in your own house, no gym membership required. If you cant find the answer your looking for hit the owner of PBFit up (Steve cooper) on facebook or on his site, he's always happy to advise people like yourself. If you take paintball seriously I would advise you take a look!