In theory, you're supposed to be slower at 44 than you were at 41. But Nick Berra's winning time in the masters 800-meter race at this year's USA Track & Field Outdoor Championships in Des Moines–1:56.27–was his fastest time in three years. At an age when many runners find they need more time to recover from workouts, Berra is training as hard as ever. The key? Some of those workouts are on an underwater treadmill. He's not cross-training to recover from injury; he's cross-training so that he can work harder without getting injured in the first place.