How Sit-Ups and Leg Raises Can Be Bad For You

Excessive core work in the form of sit-ups, leg raises, and the like is actually bad for you because these exercises cause deep muscles in the front region of the hips (deep hip flexors) to become shortened and tight. These “deep” muscles are not visible and cannot be felt as they are located underneath the abdominal muscles in front and the spinal muscles in back (see image below).

Now, I stress the term “excessive” when it comes to core work. Many people spend a large percentage of their workouts on sit-up and leg raise...

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