how do i be a better cornerback

Question
well i need advice on how to cover better hit people thats really bigger than me and how to get my speed up.im 11 years old i want to try and get in the 4s in the 40 i usually run a 5 flat.i also need help in gaining weight and growing a little taller

Answer
Ashton
You won't like my advice but I is the best advice for your situation.  You are 11 years old.  Work on the fundamentals of your position and learn as many positions as you can on offense and defense. Your speed and strength will develop as you develop.  You are only eleven and in the next 7 years you will grow taller and bigger and will become stronger and faster.  At that time you can work on techniques to run faster.  As far as gaining weight  and growing taller, Eat a healthy and balanced meals.  Learn good eating habits now at your age and let your body follow it's natural course as you as you mature.  Lastly,
If you want to play football in high school or college you need to make sure your grades are solid so learn good study habits now.