1. Lie on your back and raise your legs and bend your knees so they are bent at a 90-degree angle. Place a stability ball on your thighs and extend both arms up to hold the stability ball in place. 2.
If you’re looking to be humbled in your ab workout, swap your planks for dead bugs. This exercise looks simple at first, but it seriously challenges all of the muscles in your midsection and builds ...
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