Not sit-ups, planks, or crunches: I do this simple Pilates exercise every single day to build a strong and stable core and work on my hip flexor mobility

While exercises like sit-ups and crunches work the rectus abdominis, or "six-pack" muscles, this simple-looking exercise ...
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Tone your core with these simple Pilates exercises for beginners

Add Yahoo as a preferred source to see more of our stories on Google. Toe taps are a great way to tone the hard-to-hit lower abs. (TODAY Illustration / Courtesy Stephanie Mansour) For a strong and ...