[header] How to tone your abs with flutter kicks [title] Make sure you warm up first. [step] For an ab workout, incorporate dynamic stretching into your warm-up that will target your abdominal muscles and get them ready for more intense work. [substeps] Start your warm-up by walking or jogging in place for a few minutes to elevate your heart rate a little and increase your core temperature. 
Then you might try the " good morning " stretch, which is a good way to start engaging your core. Stand with your feet about shoulder-width apart and your hands at your waist.