A type of workout named after Green Lantern, a DC comic book superhero who fight evils with the aid of ring that grant him a variety of extraordinary powers. His alter ego is Hal Jordan. He was made into 2011 film where Ryan Reynolds played the role, who also plays the role of Deadpool, a Marvel comic book mutant superhero from X-Men.
Ryan Reynolds is really crossing Marvel and DC mainstreams. (haha)