It's because it's a pure sprint. You can't afford to go out like that over longer distances.
You don't go all out in the 400? People push the body to its full limits in every distance, they're just going faster in the 100 because it's shorter. The idea that they aren't going "all out" is nonsense.
You don't go all out in the 400? People push the body to its full limits in every distance, they're just going faster in the 100 because it's shorter. The idea that they aren't going "all out" is nonsense.
No. that's not what Mike Johnson is saying, anyway.