How can I up my 40 time?

My best advice for you this (and every) offseason is to eat healthy, exercise by doing weight lifting, and either jogging or going for a long run every day. If you do these things, you will get faster, stronger, and into better shape, which will greatly improve your 40-yard dash time, as well as your chances of becoming a successful, top notch high school varsity football player, who could go on to play college football.

By the way, your chances of playing college football depend on your performance in football during your senior year of high school. If you perform very well in football during your senior year of high school, you will greatly improve your chances of getting recruited to play for a college football program.

You can't teach speed but try:

Getting in shape, Taking longer strides, stretch more often, etc.

Just quit ya godd*mn lummox! Warp speed ahead Mr. Sluggo! I've seen grass grow faster than that!

You could possibly get better by making sure you are using the right techniques and mechanics... Talk to your coach or the track coach.. They could assist you... Good luck....

Chase rabbits.

You're supposed to run it facing forwards! Not backpedaling, you goofball.

Run faster.