K. Aleisha Fetters

If you want to shake up your core exercise routine, here's your chance: This is the ultimate intense abs workout designed specifically to target each of your core muscles. And it will definitely take your core strength to the next level, since it was concocted by Shaun T, the creator of the Insanity workout program. FTR, there are no elementary moves here — this intense abs workout (demonstrated here by trainer Rebecca Kennedy) is the real deal.  How it works: Start with 10 reps of each exercise, and see if you can level up to 15 or 20.
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