The first lady has gotten a lot of attention for her arms, and rightfully so. She's got arms that many women would give anything for. Well, here are some moves that will help you get her arms.
1 - Curl 'n Press (Recommended weight 5 15 lbs)
Works Biceps, Shoulders

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2 - Deltoid Fly (Recommended weight 3 10 lbs)
Works Shoulders

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3 - Push Up with a Row (Recommended weight 8 15 lbs)
Works Pectorals, Triceps, Lower Back, Abs, Shoulders

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Recommendation: 3 sets of these with 10 15 reps (on each side if applicable).
Make sure to combine these exercises with about 20 30 minutes of cardio and also combine them with some lower body workouts to burn even more fat and calories.