Erin Stern, a two-time Figure Olympia champion, broke down her calorie-burning back and abs workout for achieving a smaller waist.
With 7.6 million views on YouTube and the claim it’s the hardest abs workout ever in the title, I had to give this 9-minute ...
This core workout involves just four moves, but with dumbbells and minimal rest, it delivers a serious burn and maximum results.
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