SAN FRANCISCO — I’M no scientist, but I sure like reading about science. I’m always looking through newspapers for the latest research about saturated fat and whether it’s still bad for you, or if maybe sugar is poison. So when I found myself 40, fat and weak, I paid special attention to exercise science articles, in the hopes of getting strong. I found stories about cutting-edge studies that claimed you should do intense, brief workouts instead of long ones. I hired personal trainers certified by the National Academy of Sports Medicine in a training methodology “founded on scientific, evidence-based […]

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