This is a drill that you probably are already doing… the way i learned it was “Knee up, toe up, heel thru the butt.” if you are having a lot of back kick, this will help. You can do this in the kitchen standing up, just keep the hips up. best of luck, keep those times going!
It’s called “stepping over the support knee” in sprinting. Keep it as simple as possible. First work on Quad flexibility. Then concentrate on bringing the foot up as it passes underneath the butt on the way through before stepping down. There are extensive threads on this in the forum archives.
This is kind of the opposite, how do you fix or uncoach an athlete that has a problem of too much knee lift. This was drilled in by a previous coach and is now pretty much hind brain
The drill done above has very little cross over effects to any phase of a sprint. Different biomechanics include
1- Increased CT
2- Increased antagonist tension in the hamstring
3- Improper firing sequences from the hip to ankle joint. ( note how the the hip & ankle extends while the knee is still flexed).
Other then to serve the purpose of warming up ( to increase muscle temp) such drills have minimal advantages for sprinting.