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How to tone your abs with flutter kicks
Make sure you warm up first.
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.
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.