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six pack abs) and the external obliques, which allowed them to measure muscle activity.

The researchers usedcrunchesas their baseline because the muscle activity they trigger received a score of 100 percent.

So if a move caused twice as much activity as the crunch, it received a score of 200.

woman sweating in the gym

ACE Certified Personal Trainer, Health Coach, Group Fitness Instructor, and Medical Exercise Specialist, NSCA Certified Strength and Conditioning Specialist, NBHWC certified NBC-HWC, and NASM Certified Personal Trainer

Now thats called dominance!

So it shouldnt be considered the end all, be all authority on core workouts.

But its insights are still valuable.

Woman walking on a treadmill at the gym.

This will help train different muscles and combat boredom, he explains in a write-up of his findings.

The 5 most-challenging abs exercises

1.

Think left armpit to right hip.

Full body female athlete in sportswear using rowing machine during fitness workout in gym.

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ACE Certified Personal Trainer, Health Coach, Group Fitness Instructor, and Medical Exercise Specialist, NSCA Certified Strength and Conditioning Specialist, NBHWC certified NBC-HWC, and NASM Certified Personal Trainer

Now slowly tuck your knees in toward your chest.

Cross your arms over your chest and slightly tuck your chin in toward your chest.

Contract your abdominals and raise your torso up off the ball no more than 45 degrees.

Healthy female training in the gym, performing a hip thrust.

For better balance, spread your feet wider apart.

To challenge the obliques, make the exercise less stable by moving your feet closer together.

Reverse Crunch

Lie flat on a mat with your lower back pressed to the ground.

A young black woman doing post-run stretches in the park on the road amidst green grass and trees.

Lower back down with control.

It doesnt get more hard core than this.

For more ways to work your midsection, try this 10-minute workout:

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