There has been at least one peer reviewed published study that looked at the kinematic sequencing of joint actions in common sprint drills (I believe A & B skips + butt kicks) and compared it to the kinematic sequencing of joint actions during sprinting. I’m 90% sure it was published by someone out of the LSU kinesiology department (before I was there). The results indicated no correlation between the drills and sprinting. This doesn’t mean they’re not worthwhile though….just that they’re not sprinting. Any time you look at partial movement drills there’s going to be a reduced likelihood that it resembles the full movement. I’ll try to track down the study.