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Skip the gym this weekend. Go shopping instead and you'll be multi-tasking without even realizing it. According to a study conducted in Britain—and commissioned by a department store, naturally—a three-hour shopping expedition burns off enough calories to make up for eating a Big Mac:

The average woman burns around 385 calories—the equivalent of a piece of carrot cake or two large glasses of wine—trudging around stores each week. They notch up 154 miles a year—the same distance as hiking from London to Nottingham—hunting for bargains.

Or, to put it in slightly more local terms, hiking from Manhattan to Woodbury Commons three times.

Shop till you drop! [Daily Mail]