HEALTH TOPICS 
.jpg)
Sit-ups once ruled as the way to tighter abs and a slimmer waistline, while "planks" were merely flooring. Now plank exercises, in which you assume a position and hold it, are the gold standard for working your core, while classic sit-ups and crunches have fallen out of favor. Why the shift?
One reason is that sit-ups are hard on your back — they push your curved spine against the floor and work your hip flexors, the muscles that run from the thighs to the lumbar vertebrae in the lower back. When the hip flexors are too strong or too tight, they tug on the lower spine, which can create lower back discomfort.
Second, plank exercises recruit a better balance of muscles on the front, sides, and back of the body during exercise than do sit-ups, which target just a few muscles.
Finally, activities of daily living, as well as sports and recreational activities, call on your muscles to work together, not in isolation. Sit-ups or crunches strengthen just a few muscle groups. Through dynamic patterns of movement, a good core workout like plank exercises helps strengthen the entire set of core muscles you use every day.
For more on the benefits of strengthening your core, read Core Exercises, a Special Health Report from Harvard Medical School.
Image: Bigstock
Disclaimer:
As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review on all articles. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.