This is one hardcore ab routine that will get your heart pumping. It only requires 10 minutes, plus some sweat and grit. Get ready to sculpt, lengthen, and define your abs for a tighter and flatter midsection.For even more awesome abdominal and core work. Use the day-by-day breakdown for everything you need to achieve a stronger core and tighter stomach in one month flat. Every week there's a fast ab workout that you'll do for four days of the week, plus a HIIT day, a sprint day, and a rest…
