To get six-pack abs, most people think they’ll have to do hundreds of crunches. But crunches involve spinal flexion (rounding forward), and research shows that spinal flexion can lead to herniated discs. Knowing this has sent me on a long and exhaustive search for safe and effective ab training.

Last week, I stumbled onto a new study supporting my “ab crunch ban” and my preference for exercises such as the “side plank.” In this study, researchers examined six common ab exercises performed by 120 subjects to see how hard the muscles were working.

When compared to other common ab exercises, the side plank and the classic abdominal crunch both resulted in the greatest change in muscle thickness for the transverse abdominis and internal oblique muscles (meaning they were contracting the muscles more than the other exercises). However, because the side plank does not involve spinal flexion, and because it builds abdominal endurance (previously found to be associated with less low-back pain), the side plank wins this exercise battle hands down.

If you are looking for a new move to add to your total-body fat-burning workout, the side plank is the way to go. To do it, lie on your right side. Bend your right arm at the elbow and stack your left foot on top of your right foot. Supporting your bodyweight on your right forearm and your right foot, raise your body in a straight line. Your butt and thighs should hover a few inches above your mat. Keep your back straight and your hips up. Hold your abs tight, but breathe normally. Beginners should hold this position for 15 seconds on each side. Try to hold it a little longer with each workout. For advanced core strength, hold for 45 seconds per side.

[Ed. Note: If you think sit-ups and crunches are the best way to get a flat stomach, you’ve fallen victim to one of the most common fitness myths around. Discover 5 more myths about exercise – and how to combat them – right here.]

Craig Ballantyne

Craig Ballantyne is the author of The Perfect Day Formula: How to Own the Day and Control Your Life. Craig has been a contributor to Men's Health magazine for over 17 years. Today he teaches his gift to high-performing entrepreneurs how to squeeze more out of their days, increase their income, and make more quality time for their families in his Perfect Life Workshop and Work-Life Mastery programs. Craig used his own advice to overcome crippling anxiety attacks in 2006, and he'll teach you his 5 Pillars of Success so you can increase your income, decrease your work time, and live the life of your dreams. Learn more about Craig at craigballantyne.com

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