I'm probably the least flexible athlete you'll find. When it comes to yoga I can't get in the positions and I can't hold them. You have to be pretty flexible to do it. Once you get certain positions you have to have the core strength to hold those positions. It's a pretty good workout.
You can manage 50 people through the strength of your personality and lack of sleep. You can touch them all in a week and make sure they're all pointed in the right direction.
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This is just what I have thought when I have seen slaves at work – they seem to go through the motions of labor without putting strength into them. They keep their powers in reserve for their own use at night perhaps.