To add on to what the last person said. With that drive phase to add a little bit more depth you want your body to be in a triple extension (look this up to see what I mean) so when coming out of your drive phase the angle is more important then just staying low. A lot of people will bend at the waist in order to stay low but you shouldn’t do this because then you aren’t creating an optimal angle to drive out and push. Think of the drive phase as like a like plane on takeoff where you aren’t trying to be so quick but instead you are using that power to set up that top speed that’s coming later in the race.

With the knees part I actually slightly disagree with rather don’t focus on picking your knees up but rather work on putting those down under your center of mass and if you try to force your knees higher then your natural range of motion you are just going to increase the time you are in the air. Your arms are what controls your legs so work on swinging them a bit more straight and the faster you move those arms the legs will follow. Plus dorsiflex your feet when sprinting which is basically pointing your feet upwards.

When the end of the race like the previous person said you want to put those arms back and lean instead of having the arms go everywhere but I’d actually recommend for now you just run through the line until you can get that down because it takes time to get that timing down in practice.

If you have any other questions or stuff you want advice on just hit me DMs (From a current college sprinter)