Channing and Jenna Tatum met while filming Step Up, and they celebrated the movie's 10th anniversary by recreating the movie's most memorable dance move: the one where she jumps like Jennifer Grey in Dirty Dancing into his arms and he holds her aloft, like he's showing her off to someone in a low-flying plane.
Jenna's caption on Instagram reads: "We had to. #stepup10years," probably meaning they thought it would be appropriate and not that they were contractually obligated or anything.
In the original scene, he only held her up while spinning on a roof (because that's not terrifying), but in this one there's an added move where he flips her over and lowers her without dropping her (because it would be a lot less romantic if he dropped her).
This is as good a time as any to go back and re-watch Step Up, because those crazy kids are great dancers (and because the movie is so wonderfully, hilariously awful).