I've used them. I did the workout where you squat down to the ground, grab it, and then push it to the sky, and then go back down and switch arms. It works out your entire body which is great. It also kicks my ass ha ha ha ha. I feel like I ran a mile after just 1 set.
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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