MMA world saddened by lackluster training video of 58-year-old UFC champion getting ready to box 

Former UFC champion Mark Coleman recently signed a contract to compete in a celebrity boxing match later this year. Coleman will make his return to combat sports after more than a decade, having made his last MMA appearance in 2010 at UFC 109.

It is currently unclear who 'The Hammer' will face in his debut boxing match, but news of his fight appeared to cause great dismay amongst MMA fans.

A video of Coleman shadowboxing in an MMA cage in preparation for his boxing match was uploaded to Twitter, which has saddened fans online.

Prominent MMA personality on Twitter, @MacMallyMMA, posted a video of Mark Coleman training for his upcoming bout and wrote:

"When you’re high af making a PB&J in the dark at 3am and your gf turns the kitchen light on"

Watch the video below:

Many fans were concerned with the apparent state of Coleman's knees, which appeared less than stable. @Lincoln1623 said:

"Definitely almost blew that knee out. Relax Mark"

@Moustaris_ said:

"I've watched this clip almost a thousand times this week and I keep thinking he blows his knee out on that first step left"

Another fan pointed out the harsh realities of professional MMA fighting before the surge in the sport's popularity. @GauravA35696607 said:

"This is extremely disheartening. To see a legend have to go through this at an age where he should be sipping margaritas on the beach off of an impressive fight career just speaks volumes about the saddening pay structure of UFC fighters prior to the Conor McGregor revolution."

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Former UFC champion calls out Conor McGregor to a boxing match

Former UFC champion Mark Coleman has responded to Conor McGregor following the Irishman's reaction to the news of Coleman's celebrity boxing match.

Coleman has called out 'The Notorious' to a duel in the squared circle, as 'The Hammer' claimed he would "smash" McGregor in an MMA fight.

The former UFC champion took to Instagram to respond to Conor McGregor and said:

"Conor McGregor, I'm a big fan. Thank you for calling me out. Has to be in boxing, I'd smash you in MMA, you know that. You did steal a round from Khabib, but that's at 155 [pounds]. Boxing, it would probably go to a decision. We'll see who wins that. But I want a red panty night, sober is cool. Carnivore diet..."

Watch the video below: