A 'pop' sound during ground interaction indicates efficient force application in sprinters.

“it's how they interact with the ground and it's it's this qualitative component that is really hard to Define it's if you if you watch a elite boxer hit a heavy bag there's a pop sound to it pop Po and it's the same with Elite sprinters or not even Elite sprinters but anybody who's fast and effective and efficient at applying Force against an object and you see that as young as as we saw yesterday with what 12 13 14 year olds right some of them are just thuing on the ground and just pushing back and kind of like Rob your your producer”