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This plank challenge workout could be the key to toned arms and flat abs. It takes about 20 minutes (there are modifications for beginners) and will leave your arms feeling like jelly — in the best way possible.

CANT WAIT TO TRY! This plank challenge workout could be the key to toned arms and flat abs. It takes about 20 minutes (there are modifications for beginners) and will leave your arms feeling like jelly — in the best way possible.