Im going for college Football next year and im 5'10 230...and im building all muscle...because i have to play either Running back , Full back or linebacker at the size, Now i really need to gain speed, the fastest i ran was a 4.9
i need to get to at least a 4.6 what are the best exercises or best ways to do that..because im actually starting my Training in 2 weeks ...but im training myself...i dont need no help i just need to know what are the best exercises or ways to get faster? thx

BP - Check "speed work" in any search engine. A little out of the area I focus on with my clients but, I have fellow trainer friends that do quite a bit of this type of training. They have people running with small parachutes or giant rubber bands, weighted vests etc.