In the North of England, an underground fight club is pushing violence to new extremes. Spartan Bare Knuckle Fight Club is the UK’s only licensed 8x8ft bare-knuckle pit fighting promotion. Its fights are short and brutal, and often end in knockouts. But beneath the violence, the club aims to be a lifeline in difficult times. It was initially set up to prevent knife crime, allowing disputes to be settled before they escalate, with one condition: you shake hands after your fight and leave the argument in the pit. Over seven years, Spartan has become a form of community and therapy for men battling addiction and poor mental health.