Surprised? Research shows that the abdominal muscles are engaged more when doing squats than they are doing many of the more popular ab exercises. Squats require stablization in the body's core muscles in general, not just the abs. The other benefits of squats (strengthens quads, gluteals, hamstrings,etc.) are well known. So, the next time you do squats, draw your navel in toward your spine and work on those abs!