持久力就是一切

OU SEE IT in Tom Brady and Roger Federer, who competed into their 40s. In Cristiano Ronaldo and LeBron James, still domi- nating in their fifth decades. You even see it at your local gym, where grizzled veter- ans hang with meatheads half their age. Which raises the question: What do they know—and how can the rest of us stay strong and athletic decades from now? First, the sobering science: We all get weaker, slower, and stiffer. Starting around age 30, we lose muscle mass at a rate of 3 to 8 percent per decade, and mus- cle strength at about twice that rate. Most precipitous is our loss of power—the expl- osive combination of speed and strength. …