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Keep an extra set of workout clothes in your car, so if you have extra time you can get in a quick run or workout.
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Start with small goals. Here are attainable ideas: sit-ups before bed, half hour of running/walking, yoga in the morning. Increase duration as you get use to the routine.
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Stick to a schedule of working out 4-5 days a week. Make sure to give yourself at least one day off to recover and not get burnt out.
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