So Monday I skiied with my son, egro, no running. Tuesday my legs were so trashed, I skipped. Wednesday I fell asleep at 8 o'clock, and never got to it. Thursday my back was wigging out, and I was reminded of another reason why running is an imperative for me: it keeps my spine from flaring up. So it looks like 4 days is the maximum allowable interval between runs for back reasons, along with 36 hours as the optimal interval for mental health.
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