Lisa Smith-Batchen, the amazingly sunny and pixie-tailed ultrarunner from Idaho who trained through blizzards to win a six-day race in the Sahara, talks about exhaustion as if it's a playful pet. 'I love the Beast,' she says. 'I actually look forward to the Beast showing up, because every time he does, I handle him better. I get him more under control.' Once the Beast arrives, Lisa knows what she has to deal with and can get down to work. And isn't that the reason she's running through the desert in the first place-to put her training to work? To have a friendly little tussle with the Beast and show it who's boss? You can't hate the Beast and expect to beat it; the only way to truly conquer something, as every great philosopher and geneticist will tell you , is to love it.