We enter the ring for a night of chessboxing: a curious combination of four-minute speed chess and three-minute boxing.
For over 40 years, this old-school boxing club has been a hub of rebirth and redemption. But step back from the success stories and a different picture emerges.
Members of Caris Boxing Club might be marked out as anti-social, dirty and unsafe on the street, but at London's homeless boxing club they're standing up and fighting back.
Claressa 'T.Rex' Shields is fighting, against the odds, to be the best female boxer in the world.