How low can you go? People ask me that question all the time. I’ll be up at the lectern for a speaking engagement at a conference. I’ll finish my talk and open the floor for questions, and often the first person to raise a hand will ask, “How little can you get away with?” Or some variation. What they mean is, what’s the minimum amount of exercise possible to do while still ensuring that you live a long and healthy life? For ultramarathoners, Andy Magness likely is brushing up against the minimum possible. Google him—he’s all over the web, and he has an e-book about his interval-based training
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