Almost nobody at 13 has a counted approach
Middle school programs run a lot of athletes through the pit on limited runway time, so the approach usually gets taught last. A 13-year-old who counts steps and marks a start line will beat an equally athletic teammate who eyeballs it, sometimes by two feet, on identical speed. Raw speed still sets the floor, and the 100m times for a 13-year-old give you that half of it.

