Yinka Olatunji

Millions tuned in to see KSI beat Joe Weller in the biggest amateur boxing match of all time. But what didn't they see? The blood, sweat and determination underpinning KSI's intense training regime and a revealing look at his world off camera. This is the exclusive and never before seen story of Knowledge, Strength and Integrity, and how JJ, with 18m YouTube subscribers, went from actor to athlete.

An access-all-areas look at the life of global megastar KSI as he goes through the most momentous year of his life. At the height of his fame, spurred on by a break-up, the multi-millionaire YouTuber, boxer and rapper starts to re-evaluate his priorities. How did JJ Olatunji, a nerdy kid from Watford become so successful and at what cost?