How much exercise do you need each day?

Thirty minutes won't cut it. The LA Times reports:

A recent study found that overweight and obese women needed to exercise about an hour a day, five days a week to sustain weight loss. The findings bolster what some health experts — and those who have lost weight and kept it off — have been saying for years: copious amounts of exercise and adherence to a strict diet are necessary to take off the pounds and keep them at bay.

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Photo: I took this photo in Indonesia at Obama's so-called "Madrasah." Read about my visit to the school here.