When Matthew learns to relax all the time at top speed you will see the talent explode. Look at this pic in the 200 meters from the 2022 National Championships 200 Meters Mens Final. He ran 20.13 with dead legs and tight as can be. Scary to think just how good he can be when he puts all the aspects of the race together. It's called modeling phases and knowing what to do when. Mostly relax and let the speed flow through you. The sprinters that win are (NOT) running faster at the end of a 100 meters or 200 meters race. They are actually just deaccelerating at a slower rate due to relaxation of the whole body. That and your arm swing carry you when the legs are tired & built up with lactic acid!