What is the best way to improve my running speed?

Question

I love football, but the only position I am big enough to play is RB, but I am too slow. What are some good ways to improve from a 6.5 sec. 40 yd dash into a 4.5?

Answer 1

nike sparq training. it makes you quicker and faster. used it to improve my footwork and i became faster. and i play CB