I was going to mention this but thought the whole reply was a bit long, this is an anecdote of mine.
I’ve done martial arts for many years, out of all of them Judo was where I spent the most time. While taking my phys. ed. degree I was taking advanced biomechanics and we were replicating a study done on the influence of foot position over a 40 yard sprint. We used timing gates at 5 yards, 10 yards, 20 yards and 40 yards to give us split times.
Now I should mention that I had been out of any martial arts for a while and I was fat (22%) and I felt slow. In our class we had three sprinters, one who ran the 100 and 200m at a national level. A running back and a reciever from the football team.
When we did the test and the results came in the guys were laughing at me because I was the slowest male in the class (thank God none of the girls were sprinters or it could have been worse).
When we got back to class and our prof put all the results up I was again being mocked for my lack of speed. This is when my prof pointed out that while I was the slowest male through the full 40 I was the fastest through the first 5 yards. I was still the fastest at the 10 yard mark and one of the sprinters (the reciever) had tied me at the 20 yard mark.
That kind of shut them up. Our prof pointed out that my lack of overall speed was simply the result of poor running mechanics (something about a duck with a firecracker up it’s ass. . .) but I digress. He also pointed out that while he could teach me to run properly he could never teach them to start like I could.
Why was I so fast? Judo! Afterall the first 5 feet are really all that matter, I just managed to carry that a little further.
So this is a story of specificity, remember to train over short distances and in a motion pattern relevant to your sport.