The weight maintenance equation is simple: Calories in = calories out. You obtain “calories in” from food. You expend “calories out” primarily through daily activity and exercise.
To maintain your weight, balance calories in with calories out. Even an extra 100 calories in each day promotes steady weight gain. Although there are many aspects to weight management, every practice affects the balance between calories in and calories out.

How do you get extra activity each day? 
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