If you just can't seem to get revved up and active today, then maybe you should stop trying so hard. If you're part of a team or partnership, let the other people take over the reigns for a while. Let them push things along while you take a break. Give them motivational and emotional support. That's the value of teamwork, isn't it? You've taken up the slack when other people haven't felt quite up to the task, and now it is their turn to pick up the slack for you. They won't mind.