"I think you will be shocked at what this can do," O'Brien said of his physique as he met Gadot to take part in a round of exercises that the actress went through in order to prepare for the role of Wonder Woman.
When the late night host asked Gadot what were his strengths and weaknesses, she replied "Very weak legs." Afterwards, the 32-year-olds trainer Ruda Vrba agreed with the statement after O'Brien struggled to execute some high kicks.
The rest of the training included O'Brien taking part in swordplay and CGI bullet dodging while wearing Wonder Woman's signature bracelets
O'Brien then donned his own superhero costume complete with padded muscles and a bulge at his crotch in an effort to impress Gadot.
"It's really, really, really...it's just different," she said of the outfit.
On June 3, DC Comics will be holding a special day to celebrate Wonder Woman that will include guest speakers and free comic books that will be handed out at more than 2,000 comic book stores, bookstores and libraries.