I understood the not-dying part, but asked him how he determines if something is hard enough. “We’re generally guided by the idea that you should have a fifty percent chance of success—if you do everything right,” he said. “So if you decided you wanted to run a twenty-five-mile trail, and you’re preparing by working up to a twenty-mile training run and doing thirty-five or forty miles a week of running…that’s not a misogi. Your chance of failure is too low. But if you’ve never run more than ten miles, think you could probably run fifteen, but are iffy on whether you could run twenty…then that
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