KSI gave a glimpse into his training to fight Joe Fournier and admits he has to win or else face mockery from bitter rival Jake Paul.
The YouTube, music and crossover boxing star returns on May 13 at Wembley Arena for his seventh bout.
KSI, 29, faces millionaire nightclub tycoon-turned 9-0 boxer Fournier, 40, in what promises to be his toughest test to date.
So he is leaving no stone unturned and released footage of a gruelling sparring session with unbeaten boxer Idris Virgo.
KSI captioned the post: “This is what I gotta do to prepare for my next fight May 13th.
“I’m not taking Joe Fournier lightly, especially since he’s a 9-0 pro the odds are stacked against me.
“He’s a better boxer than me and has more experience than me, plus I know if I lose this, Jake Paul and his fans are gonna have a field day.
“May 13th I’ll put my all into it and will hopefully not let you down.”
Virgo added: “He doesn’t know what’s coming. Joe’s in trouble come May 13th.”
KSI last beat online rival Faze Temperrr in the first round in January.
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And he hoped to finally face Paul, 26, this year as the two talked up an end of year blockbuster.
But those plans face the KO after the American was beaten by Tommy Fury by split decision in February.
KSI wants Paul to forget about a rematch with Fury to instead fight him but the pair recently clashed during a spat on Twitter.