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Plank with Arm Extension: You know and love the trusty plank—after all, it’s the move for a flat belly. But if you do it frequently enough, you’re probably ready to switch it up a bit. This plank variation engages your glutes, shoulders, upper back, and (of course) core. Drop it low, girl.
SO…ARE YOU IN?!
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Moves That Work Better When You Do Them Back to Back
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6 Trainers’ Favorite Workout Moves for Stronger, Flatter Abs