I’ve been trying to stay more upright in my sprints but I still feel slow. How can I improve my ankle stiffness? Anything helps, thank you guys! You can be brutally honest too lol

I’m a quarterback that ran a heavy spread offense that had me get the ball out quick so I never really had to run. I’ve never had a sprinting coach so running was never my strong suit. Going to college next fall, speed is one of my weak points. Any tips?