Sit-Ups, Crunches, Planks, Knee-Ups: The Evolution of Core Fitness
By A Mystery Man Writer
Description
Core strength testing has come a long way from the straight-legged, twisting sit-ups used before World War II.
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How many sit-ups you need to do to see results is initially very few and will continue to increase as you get stronger. How soon will I see results from sit-ups? How
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