Practice. That's all you need. Run everyday, do track or something. It helps, seriously(:
I am in the same boat only for soccer. I am pretty skilled I just don't have brekaway speed to blow by defenders. However, sprinting parachutes are very useful, also exercises to strengthen your calves and muscles in your feet help. For example calf rises with weights are great, running will do you well. Running on toes will strengthen calves too.
You either have it or you don't it's simple.
There's certain training that can make you a little faster and maximize your running efficiency but. You just have to be born with it. There's nothing you can do become the fastest person on the team... If that were the case the hardest working people would all have randy moss speed.
I don't know if you can ever increase speed...........but footquickness can be learned.......and their's many different ways......And what all good coaches look for is the quick feet. Quick hands.....and most of all Quick mind.
the best thing you can do for yourself is called the ladder. I think nike sparq sells them now, but you can get a cheap one. They're basically rope ladders and you lay them down on the ground and do different routines. You can start simple like one foot in each box, then two feet, then one in one out...There are sooooooo many different combinations our football team does. But the most important thing is to stay on your toes, and burst out of the ladder, it'll improve your twitching muscles in your legs which gives you acceleration off the ball.
resistance training,i have seen my nephews increase their speed buy using bands and doing quick burst. there might be more info at www.joedbands.com,that is where they got theirs at.all 3 of my nephews played or are playing college football