United Kingdom, May 31 -- KSI is leaving the Sidemen after more than a decade.

Describing the decision as "painful" and admitting he needs to focus on his health, family and work-life balance,

the 32-year-old Britain's Got Talent judge - real name Olajide Olayinka Williams Olatunji - revealed in a video released online he will no longer appear in Sidemen videos.

The YouTube star, musician, boxer and now reality show judge said the choice had taken months of consideration.

KSI said: "This is honestly the hardest video I've ever had to make in my life. I've gone back and forth on this decision for a very long time. I've spent months trying to figure out what the right thing to do is.

"But after a lot of thought, I've decided that I'm n...