Clinton praises Muhammad Ali's courage, spirit and determination

Bill Clinton praises the courage, spirit and determination of Muhammad Ali, external, who turned 70 on Tuesday, with the former United States President describing Ali as "a ballerina in the boxing ring".

Watch The Then and Now of Muhammad Ali on BBC Four and the BBC Sport website, Tuesday 17 January 2200 GMT.

You can also hear more on the life of Muhammad Ali in a BBC Radio 5 live sport special featuring an interview with Bill Clinton in a look back on the life of the former heavy weight champion and political figurehead. Thursday at 2030 GMT.