First we come to WBA/IBF/WBO/IBO heavyweight champion Klitschko, the younger half of the brotherly double-act that has dominated boxing's most-famous weight division for many years now.
As a relatively quiet, modest, intelligent and respectful fighter, Ukrainian Klitschko doesn't often get the credit he deserves for just how imposing and powerful he is.
As well as his obvious height and incredible reach, the 38-year-old - nicknamed 'Dr Steelhammer' - obviously works very hard in the gym to maintain such peak physical condition.
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