Quote Originally Posted by bulldawg28 View Post
Speed comes from genetics. You can become quicker aka explosive once your 19 or you're not getting faster.
Let’s say your genetic potential is a 4.7 forty with minimal body fat and lots of squats, weight room work and sprinting/agility drills, core work.

However you are not 9-10 % body fat, you really don’t squat much and lack muscle tone.

Of course you can make yourself faster aka reach your genetic potential.

Walter Payton had to run a lot of hills to get as fast and strong as he was.