Our work with elite athletes serves as the proving grounds for our methods. Most people don’t play professional sports. But if our methods help athletes at the highest levels, they can work for anyone.
The “butt tight” part of the bracing sequence is basically just a pelvis-aligner. It’s to help you get your pelvis into a good position, which then allows you to achieve a good spine position which is what you are trying to brace.
You can’t really keep your glutes on full blast and complete those movements. There has to be a constantly-adjusted tension tension through these tissues to allow you to go through their full lengths.