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What gym do J.Lo and Dwayne "the Rock" Johnson go to? We should sign up too, but it must be tough — and expensive! "Just a couple of gym rats gettin' it in!!" she captioned it. "@therock thanks for the love and for all the positive energy and inspiration you put out into the world!! #hardworkwins #youcantstopwhatwontstop #erryday." (Photo: Instagram)