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9. Workout with intervals

You didn't think you wouldn't have to sweat, did you? Interval workouts are ideal for quick results. At least three times a week do an hour long cardio session that goes like this: 10 four-minute high-intensity bursts followed by two minutes of slower movement. So if you're running, sprint for each burst and then power-walk or slow jog in-between. Sounds doable, no?

[Photo via @tashoakley]

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