Improve Linebacker Speed & Agility: Exercises & Drills

Question
I am a linebacker at my school, I'm 5'11" and around 185 pounds. i have good strength, but is there any specific excercises i can do to get quicker? my 40 yard dash time is at best a 4.85. any tips and/or things i can do to help better running?

Answer
Dear John,

http://www.youtube.com/watch?v=W7sQ5_VwlcM&feature=related

http://www.youtube.com/watch?v=znxti4DF9hY&feature=channel

http://www.youtube.com/watch?v=RN2qmB3HqKc&feature=channel

http://www.youtube.com/watch?v=gfV3V8AK42A&feature=channel

http://www.youtube.com/watch?v=dyGTBIsKU4w

http://www.youtube.com/watch?v=HaqOVTah7bE


Let me know what you think and if you need anymore help?
Your friend, Louis