Mr. Rewrite has a reader question pending on compound modifiers and hyphenation rules. He isn't ready to post on that, but he has done enough research to say with confidence that the headline above should hyphenate super-motivated.
The AP Stylebook says to drop the hyphen from a compound modifier (a.k.a. phrasal adjective) that occurs after the noun EXCEPT when it follows a form of the verb "to be."
Mr. Rewrite's take is that the headline above assumes a "to be" verb. These workout champs are super-motivated. He's making some assumptions here and basing this post entirely on his interpretation of AP style, so please set him straight if he's incorrect.