I'm trying to figure out whether starting the 100m sprint crouched like they do in the olympics is better than starting it standing. I thought maybe that's just a "sport rule", not something that actually makes the race faster. If you can link me actual videos or experiments I'd appreciate it very much.
A crouched start is more effective than a standing start as it places the sprinter in a position to move the center of gravity rapidly well ahead of the feet and thus the runner must accelerate very quickly or else fall.
Here is a wonderful article with a study comparing both, the standing and crouching styles, giving details at each milestone.