This yoga flow will strengthen your core and tone your abs!  Focus on moving slowly through each yoga posture and breathing deeply.  Make sure you keep drawing your navel in toward your spine to help protect your back.  You can drop to your knees if you need to in plank pose.  You can repeat this flow 5-10 times.  Also, this flow can be combined with my fun flow for legs and glutes (see my last post) for a challenging and quick workout.  If you are combining both flows do a set of 5-10 for each flow.