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Tighten your abdominal muscles and protect your spine with the most effective ab exercises from the American Council on Exercise (ACE). Learn proper techniques and step-by-step instruction from America's Authority on Fitness. This large collection of exercises is also featured in complete workout routines that include full-body and at-home workouts. Whether you?re looking for beginner level training or advanced fitness programs, we have something here for everyone to target core muscle groups. Choose from a wide variety of lower ab exercises, standing trunk rotations, reverse crunches and more.