Sit-ups are the natural exercise for developing the abdominal muscles. You should do 50 to 100 of them every day or at least every other day. As you gain strength and they become easier, you can hold a barbell plate to your chest to make them more challenging. This is the simple formula for strengthening your abdominal muscles.
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from ezaine1 http://ift.tt/1m6rDG0
via IFTTT
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