@sprintcelin r/Sprinting • Recommends
On “Don't use quads at all, how to fix this?”
Your quads aren’t the problem. You need to orient your legs so that they do most of the movement in front of the body. This is called “frontside mechanics.” Check out Carl Lewis, Frankie Fredericks, and Asafa Powell to see this in action. A good way to train this movement is with Loren Seagrave’s thigh pop drills.
Video: link to this video
Ralph Mann discussing frontside mechanics with an athlete: link to this video