Leaders don’t ask anyone to do what they wouldn’t. They just go first and let the team follow.

Authority handed over with a title runs out quickly. What people follow is somebody doing the thing they are asking for, including the unpleasant part, without making a point of it. That removes the argument completely, because nobody can call it unreasonable while you are already doing it. Instructions issued from the sideline get obeyed slowly and resented fast.

Whatever you want from the group this week, do it visibly yourself first and say nothing about it. Take the worst job once. That will get you further than any speech about standards.