I've always been really athletic which really helped because when I first started doing the training for Bulletproof Monk it required so much strength that if I didn't have a base I don't really know what I would have done.
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.