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Fit in 15 is very simple: just do a combination of 15 minute workouts to see results. There are four main workouts:

• Cardio 15: 30 second bursts of high intensity training alternated with 15 seconds rest periods
• Arms 15: High intensity exercises with weights
• Legs 15: A squat-tastic fifteen minutes of high energy leg exercises
• Core 15: Fifteen minutes of intense abdominals work