Often, significant breakdown suffered by runners & sprinters, due to lack of proper pacing &/or lack of preparation.
Often elites positive split 400m & 800m too much, rarely 1500m to 10000m. Camera hog elites sometimes positive split Marathon to much.
Junior high school kids to 60 or 70 minute 10K runners positive split races far too often. That's the pain, significant positive splitting.
* Did 1976 Olympics men 1500m final hurt elites? Not until about 150m to go.
* Did 2021 Olympics men 800m final hurt elites? No until about 150m to go.
* Did 1992 Olympics men 1500m final hurt elites? Not until about 200m to go.