@anonymosib Mike Robertson (online fitness personality and athletic coach based off Indiniapolis, a big advocate of the exercise) says it teaches the person to "disassociate the trunk from the pelvis." But a good pre-requisite for a deadbug, I think is a solid abdominal brace. In that regard the McGill curl-up makes a solid regression to the deadbug (or a solid stand-alone anterior core exercise even imo)