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Man United legend Cristiano Ronaldo laughs at Rio Ferdinand's regime

Despite retiring from the game over a year ago, Rio Ferdinand still likes to keep himself trim with a regular workout regime.

Indeed, the former Manchester United defender posted a video of himself going through his paces with a couple of early morning "bear crawls" -- only to find himself being heckled by one of his former teammates.

Bear crawls this morning.. working on core & shoulder stability!! These mornings getting cold & frosty! ❄️❄️❄️

A video posted by Rio Ferdinand (@rioferdy5) on

Shortly after sharing the clip, Ferdinand received a friendly jeer in the comments section from none other that Cristiano Ronaldo.

In response to the video of Ferdinand scuttling around in his garden for a couple of seconds, Ronaldo replied: "wtf is that ??????"

To be fair, if anybody knows what it takes to spend each and every day working out non-stop, it's our Cristiano.