A couple of decades ago, the powers that be decreed that to stay fit, you needed only to do a moderate exercise for 20 minutes, 3 times a week. Do-able!, I thought, then went along on my merry way, not actually doing it.
Then, a few years back, the figures were revised upward to 30 minutes of exercise five times a week. Okay, I said to myself, I can find a half hour every day. But I didn't.
Now, a set of new and more sinister recommendations have come out. It appears that for "significant" weight-loss and to prevent regaining weight after weight-loss, you need on the order of 300 minutes a week of moderate-intensity activity. This is in addition to strength training, which the American College of Sports Medicine also recommends.
Luckily I am an exercise freak right now, so 300 minutes of exercise a week is well within my time-for-exercise budget. But I also don't have a job. And I have only one kid, who is in school for six hours a day. I don't see how other people who do have jobs or young children in the picture could possibly carve out an hour every day to exercise.
Since dieting alone doesn't seem to cut it for long-term weight-loss, I think we've found yet another piece of the "obesity crisis" puzzle.