Floyd Mayweather,he's the best because he shows a dedication to the sport like no other

Paul Williams-12 miles jogging nearly everyday to keep that 6ft 1 inch frame at ww?! That;s dedication and also,throws tremendous amount of leather without tiring!!

Antonio Margarito- Emmanuel Steward said he has really really impressed with his stamina when he took some fighters to spar with him because Tony did 12 rounds twice of non stop punching or something,stays in shape all year even when not preparing for a fight and rarely goes above 165 I think it was. Throws HUGE amounts of leather.

Calzaghe- His performance against Lacy says it all about his fitness.