Same guy wrote:
https://www.brianmac.co.uk/mobile//articles/scni40a4.htm"My interpretation, from discussions with Gerard Mach and Biancani, as well as my extensive use of these drills over the years is that their primary benefit is not as technique drills. They are drills that specifically strengthen the muscles in postures and actions that are similar to those that occur during the sprint action. It is through strengthening in the specific positions that technique is improved"
Thanks for posting this. It summarizes what was wrong with my running for 5+ years while in school.
Coaches had us do 30+ minutes of drills every day. High knees, butkicks, and all kinds of skips. Then we'd do our running workouts. This absolutely ruined my running for several reasons.
First of all, 30 minutes of skipping and high knees is incredibly taxing if done at high effort. I usually did them at high effort because I didn't want to be a slacker and honestly thought it would help me improve. Basically half an hour of plyometrics. So I was absolutely shot for the actual running later.
I also thought that the motions done during high knees and butkicks were precisely the motions I was to emulate while running fast. I probably took things too literally, but this was the impression my coach gave me.
So when running workouts after warmup, I'd remember how it felt to have extreme high knees during the warmup, and force myself to do this in my stride. I'd do the same with butkicks, and force myself to heel-to-glute with every stride. What resulted was an extremely exaggerated running form, that looked alright at first glance but was incredibly inefficient.
Instead of running on reflex, drills taught me to force every movement. Imagine consciously moving your arms and legs through every phase of your running stride. It's insane, but that's what I did for years because it's how I interpreted the cues my coaches gave me.
I did notice that my running would feel much more effortless when I skipped doing drills in the summers. But upon returning to school every year we'd get back to the drills, and my running would almost immediately deteriorate. I'd suddenly feel much more strained running, and my easy and 5K paces would drop by a minute and 30 sec respectively. It was incredibly frustrating as I knew I was in shape to run much faster than I did, but with drills and running workouts way too quickly, I'd decay into a pitiful runner by the end of every season.
My advice to coaches would be to avoid drills unless you and your athletes really know what they are doing.