Rio Ferdinand: Cristiano Ronaldo ribs ex-United mate over video

The Real Madrid ace mocked a clip posted by his former Manchester United colleague - who then responded to the Portuguese...

Cristiano Ronaldo has teased ex-Manchester United team-mate Rio Ferdinand on social media after the player-turned-pundit posted a video of his work-out regime.

Ferdinand, who retired in May 2015, still keeps himself in tip-top shape and on Monday shared a clip of a 'bear crawl' fitness exercise on his Instagram profile.

CR7 takes the mickey 

And Real Madrid star Cristiano, who shared the United dressing room with Ferdinand from 2003 to 2009, commented on the video with a jokey dig at the 37-year-old.

"Wtf is that??????" quipped the Portugal captain.

Cristiano (left) and Ferdinand spent six years together at the Red Devils.

Rio responds to Ronnie

It didn't take long for Ferdinand to have a cheeky jibe back at Cristiano, with a reference to the fact that Real's all-time highest scorer is also the wrong side of 30.

"You need this in your life," the former England skipper, now a regular on BT Sport's football coverage, retorted. "You need the back and core strong at your age now!! I wish I done this stuff when I played!"