Physical biorhythm cycles span 23 whole days
The sheer physical endurance of your body fluctuates on a completely arbitrary numerical wave. Catch it on an upswing and you can run a marathon; on a downswing, getting off the couch is a Herculean task. It offers a wonderfully complex graph to explain standard human laziness.

This article describes beliefs and cultural traditions, which are not necessarily scientifically established facts.
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