-Jump Rope
-Box jumps - find a sturdy box and stand to one side of it, jump onto it and then imediately jump off the other side - do this as fast as you can
-Run stairs
-Run hills, it strengthens your muscles.
-Find a rope ladder and practice running through each slot as fast as you can.
-Jump back and forth across a line...both feet and one legged as well
**Most importantly, increase your arm speed, it will make your feet go faster