How to Make Your Core Muscles Stronger
5 Moves to Build a Stronger Core — and Not 1 of Them Is a Crunch
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"A bird-dog crunch is basically a complex plank coupled with a crunch. So, if you love doing planks and crunches, this combines them. Plus, you strengthen your lower back and improve your balance and stability which leads to improved strength overall," said Chadwell.
How to do bird-dog crunches: