In this week’s Sport: forty years on from the Rumble in the Jungle, a study into why Muhammad Ali’s story continues to resonate and a closer look at the fighter who has become a sporting legend | The Invincibles: the inside story of Arsenal’s 2003/2004 season from Amy Lawrence’s new book on Arsene Wenger’s immortal side | Professional poker – Sport learns when to hold ‘em and when to fold ‘em | Emma Pooley on why 2014 could be a tipping point for equality in cycling | Plus: ahead of the first El Clasico of the season, Guillem Balague talks about whether Real Madrid and Barcelona’s dominance has had a negative effect on Spanish football
