Howard Winstone, Johnny Owen, Joe Calzaghe: why have the south Wales valleys produced so many boxing champions?
As part of BBC Cymru Wales' Real Valleys season, we are bringing you a special documentary - The Valleys Fighter - as Liam Williams, a young boxer from Clydach Vale, follows in the footsteps of legendary fighters and heads towards his first professional title.
To get you in the mood, we have been digging out some of the best Sport Wales boxing features from the archives. And there are few better than this one from 2013, when we went training at night with Cefn Fforest's Nathan Cleverly ahead of his world title defence against Robin Krasniqi.
The Valleys Fighter airs on BBC One Wales at 10.45pm on Monday, 30 March.