Check out this circuit you can add to the end of your workout to challenge your core strength. It'll help you get a flatter stomach at 50.
Health Tips for a Flat Stomach & Bigger Butt
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How to Get a Flat Stomach (with Pictures) - wikiHow
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28-Day Flat Belly Challenge: Trim and Tone Your Midsection - BetterMe
How to Get A Flat Stomach - Flat Stomach Workout From Holly Perksins