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Updated 17 September 2015

Abs right

You're doing it wrong: When doing crunches, you're just lifting your shoulders off the ground and flexing your ab muscle (rectus abdominus) without engaging the waist or the lower abdomen (obliques and transverse abdominus). This could create a muscle imbalance which may result in back problems if you don't focus on your inner core muscles. Planking is a more beneficial alternative to crunches as it also works the transverse abdominus muscle (your core).

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