If you want to have a toned stomach, this ab exercise might just be what you're looking for! It might look deadly at first glance, but according to a study on the Journal of Orthopaedic and Sports Physical Therapy, it really works because it focuses on just your abs!

The exercise is called a combination swiss ball pike and roll, and according to ThePostGame.com, once you've got the routine down pat, you can get enough abdominal exercise for one workout by doing it less than 10 times.  

Check out trainer Nick Tumminello demonstrating the moves in the video below to find out how it works!

(Screencap via YouTube)

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