Simply walk around your neighborhood to get your heart pumping. Start with 15 minutes a day.
Stand with feet shoulder-width apart, send hips back like sitting in a chair. Engage core. Do 2 sets of 10 reps.
Hold a high plank position, keeping back flat. Start with holding for 30 seconds, working up to 60 seconds.
Hands slightly wider than shoulders, lower chest to floor. Do 2 sets of 5-10 reps. Modify on knees if needed.
Lie on back, knees bent, hands behind head. Contract abs to lift torso. Do 2 sets of 10-15 reps.