In your quest for a rock solid core, the exercises you choose to do are important to consider. Crunches alone will not get you very far in your quest. A variety of exercises are necessary to hit all the major core musculature.
How you accomplish these exercises is important as well. A specific intensity must be met to stimulate the muscles in such a way that they will grow, especially if visible stomach muscles are one of your goals. Notice how distance runners do not have large leg muscles, despite working out their legs for hours each week. For the same reason, doing hundreds of crunches will not cause significant muscle growth. Exercises must be of a certain intensity that fatigue is reached in about 8-15 repetitions, or 20-45 seconds of work for maximal muscle growth to occur.
AND BY FAR, the most important factor to consider if “Six-pack abs” are a goal of yours is body fat percentage. If you’re not down to at least 13% body fat for men and 20% body fat for women, all the crunches in the world won’t be enough. Continue reading

