EXCLUSIVE

The new "Dancing with the Stars" cast could have its hardest bodies yet -- a bunch of pro athletes and an Olympian -- along with something new ... a YouTube superstar, TMZ has learned.

We got a hold of the 'DWTS' producers wish list -- the celebs they're gunning to get for Season 19 -- and it includes 'Bachelorette' Andi Dorfman, ex-UFC fighter Randy Couture, "American Ninja Warrior" contestant Kacy Catanzaro, Olympic track star Lolo Jones and Antonio Sabato Jr.

Our 'DWTS' sources tell us they're also trying to land a female YouTube star ... who we're told has tens of millions of followers. It's a smart ploy for a veteran show with aging viewers to pull in fresh, younger viewers.