Day 4 Cardio Thirty minutes on the elliptical. Strength Training Side lunges: 10 reps on each side; repeat three times. Push-ups: Three sets of 10 reps each. Scissor kicks: Three sets of 10 reps each, or one set of 30. High knees: Three sets of 10 reps each, or one set of 30. Leg raises: Three sets of 10 reps each. Image Source: Getty / Hinterhaus Productions