FANS have expressed their concerns after Jon JOnes shared his latest training video ahead of his move up to heavyweight.
Bones, 33, has not fought since last February, when he narrowly outpointed Dominick Reyes.
The American all-time great then vacated his UFC light-heavyweight title with the plan to move up to heavyweight in 2021.
Champion Stipe Miocic is set to defend his belt against Francis Ngannou at UFC 260 in March, the man he beat in 2018.
Promoter White revealed Jones is then in line to face the winner, in what would be his divisional debut.
But supporters reckon the US star is well off the pace based on his latest training video.
Jones posted a clip of himself hitting pads at his JacksonWink Academy gym.
It's the first time Bones has shown off his striking ability as a would-be heavyweight.
He playfully captioned the video, shared to Twitter: "I feel like I move pretty good for a fat boy.
"I believe I’ll be moving at my all-time best once I actually get in shape."
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But fans were less than impressed, with one saying: "I wouldn’t have posted this. You looking slower bro."
Another wrote: "Yikes. Definitely looks like a heavyweight...
"Slow and sloppy and this is just pad work, I can only imagine what sparring looks like."
A third added: "Sheesh, looking a little slow."
Earlier this week, dad-of-three Jones shared a heartwarming clip as he put one of his daughters through her paces in a home workout.
The American has three girls with long-time partner Jessie Moses - Leah, Carmen Nicole and Olivia Haven.
He revealed last April that all three were learning martial arts during lockdown.
Almost a year on, and Jones gave fans an update as he revealed some boxing training with one of his daughters.
In the clip, she shows off some expert defence, slipping and rolling, while throwing combinations with her dad.