We live in a culture that sees extreme exercise as crazy,” Dr. Bramble says, “because that’s what our brain tells us: why fire up the machine if you don’t have to?”
To be fair, our brain knew what it was talking about for 99 percent of our history; sitting around was a luxury, so when you had the chance to rest and recover, you grabbed it. Only recently have we come up with the technology to turn lazing around into a way of life; we’ve taken our sinewy, durable, hunter-gatherer bodies and plunked them into an artificial world of leisure.
Just read, and enjoyed, Chris McDougall’s “Born to Run”. Here’s my review of it, on Goodreads