Twenty…30…55. The numbers being tossed out right now about how many minutes you should work out sound more like an auction for the queen's underwear than organized goals. Just as you got used to hearing that you should get 30 minutes of moderate activity a day, along comes new evidence that you need 55 minutes most days of the week. And what, exactly, does "activity" mean? Well, keep your sneakers on: It's not as confusing as it sounds.
Why the different numbers? They're about different payoffs. The "30 minutes" guideline is the minimum that the Centers for Disease Control recommend for staving off chronic disease. The "55 minutes" number is from a new study in which people who did that much kept off 10 percent of their weight.
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