Quite the opposite. I'm only in my 30's, but I no longer feel fit as I once was back when I could run a 33 minute 10k. Even long after leaving serious trainin

Quite the opposite. I'm only in my 30's, but I no longer feel fit as I once was back when I could run a 33 minute 10k. Even long after leaving serious training behind and getting a bit heavier, I continued to go for a 3-4 hour run in the mountains every other week or so and did shorter runs at least a couple of times a week. As recently as two years ago, I had a resting pulse of 48 BPM. I lived at the top of a 6 floor apartment building. Unlike my guests, I was rarely winded at the top, even going up the stairs with a backpack. I even played pick-up games of basketball in the park after pub crawls with my buddies. It felt like my energy was boundless. My habits changed after moving to Beijing. The air here isn't so good, so I don't enjoy running anymore. Instead, I've been going to the gym and doing something very similar to what the article recommended, actually! I'm stronger than ever before, squatting about 170kg. I'm not fitter, though. I'm fatter. My resting pulse is up to 70 and while the subway is no problem, several flights of stairs are off-putting. A full-court game of basketball would probably make me feel ill.