Ready for a challenge? Grab a medicine ball and try the juggling plank, which might just be the hardest upper body exercise you'll do all week. There’s no easy plank. That’s a fact. Whether you’re on ...
GUINNESS RECORD HOLDER KAI SANDMEYER, SAYING:"My name is Kai Sandmeyer, I currently hold the record in "longest hula hooping in abdominal plank position" with six minutes 34 seconds." "The hardest ...
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