Every year on January 2, millions of Americans go on diets. Whether it's part of a New Year's resolution or an antidote to six weeks of holiday eating, the January diet is as American as the Christmas binge.

But most people who gain between a half-pound and a pound during the holidays don't successfully lose the weight and keep it off.

It might be because many Americans don't exercise regularly, and the cold, dark winter months can be a tough time to stay motivated on a new fitness plan. But don't let the frosty weather and short days keep you inside.

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