"Hey DJ. It's 5:45am in NYC. No hurricane .....just time to FOCUS !!" he captioned it.
Johnson and Jackman's bromance started when the Aussie got training tips from the ripped former wrestler to beef up for last year's The Wolverine.
Johnson told AAP while promoting Hercules earlier this year that he was proud of Jackman, saying he "took it to another level" for Wolverine.
"Hugh and I are buddies so we share tips," Johnson says.
"He's one of the few, if not the only one, that I know at that level, in terms of stardom, who commits in terms of physically.
"It's one thing if you commit and the actor loses weight or gains weight just for a particular role and then gets terribly out of shape after that.
"Hugh, when he commits, he's just full-on. Very proud of him and his work."
- AAP