He is an idol for most of us. His never give up attitude made him the best! In true words, Muhammad Ali has been considered to be a champion.
He began his training at the age of 12 and won world heavyweight championship at the age of 22. Ali, who was not allowed to fight for 4 consecutive years, made a fightback and won Lineal world heavyweight championships namely in years 1964, 1974 and 1978.
Checkout this compilation of his top 10 knockout bouts.