This 9-minute ab workout uses one piece of equipment to build a stronger, more functional core

Carve out just nine minutes a day, five to six times a week, and watch how your core transforms.
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Forget The Reps - 6 Static Core Exercises That Are Best For Firing Up Your Deep Abdominals

98, 99, 100…you mutter through pursed lips, before collapsing flat on your back on the gym floor. Your core crunched to oblivion, your hip flexors probably firing on all cylinders and your neck a ...