A lot of beginners make the mistake of going to the gym, doing bench presses and expecting their sprinting time to improve. If you want your performance to increase, you have to remember two things when training.
Practice the movement. You won’t get better at jumping if all you do is jog for an hour. Doing 50 pullups non-stop in a set won’t help either. You have to jump. Train the jump.
Develop the muscle. Sometimes, beginners think quads when they hear sprint. When they want to improve their sprint, they supplement running with leg extensions. They don’t realize that the true sprinting powerhouse comes from the posterior chain, as in hamstrings and glutes among other things.
You shouldn’t make the same mistake. Know which muscles are the most involved. Revolve your supplement exercises around that.
That’s my 2 cents. I hope I helped some beginners out there.