No, not crunches: Try this 8-minute 'secret' workout to build a strong and stable core over 50

This eight-minute workout is the secret to firing up your core muscles and building strength and stability in your midsection ...
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I did this trainer's 6-minute core workout everyday for a week — here's what happened to my body

I recently discovered a three-move core-building workout from one of my favorite online fitness trainers and decided I'd use the routine every single day for the week. My goal? To build a better habit ...