Hey guys,
When I perform my scap shrugs, my stomach seems to sag a little bit in the "shrug" part of the movement where you are pinching your scaps together.
After rewatching the example video in F1 dozens of times, it is just too difficult to determine if the athlete's stomach sags a little bit since the video is not from a side angle.
So, does proper mastery form include maintaining the tight hollow body shape during the shrug portion, or is it allowed to break down a little and allow for a slight stomach sag?
Thanks for the help!