Walking on what was meant to be a run on the left: standing at the back of a finished spin class, which I did at about 40% effort, on the rightIf you know me, you’re probably tired of hearing me rattle on about my running, walking, and strength training adventures (sorry, loved ones). That’s partly because I’m insufferable. But it’s also because I never imagined I’d get into sports – before the age of 23, I hated the idea. Now, though, I worry I’ve become a victim of the same conscientiousness some research suggests might have put me off physical activity for years. Until about two months ago, I found myself skipping as many as thre