Climbing out of the Grand Canyon, Pranjal Karmakar had an a-ha moment. “I could see other folks who looked older than I was, and they were doing much better,” he recalls. “I knew then it was time to take action when I got home.” He and his wife, Deepa, love traveling to hike in national parks. But the hiking he was already doing wasn’t enough. “At some point, you start losing muscle and strength,” he says. “It made sense to do regular strength exercises.” Which brings up a question we hear all the time: Isn’t walking “good enough?” The short…
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