With the under-18 indoor mile world record under his belt, 16-year-old Sam Ruthe is poised for greatness. He also has modern coaching and shoe tech on his side.
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Ancient humans chose to sleep less, which had evolutionary benefits. For modern humans, sleeping less is futile and detrimental, but fitness may be a powerful ally in today’s epidemic of sleep loss.
Here’s how elite endurance athletes differ from the rest of us.
