He was a champion Boxer
Muhammad Ali (born Cassius Marcellus Clay Jr) was a famous American professional boxer, and a world champion.
Muhammad Ali was famous for being a Boxer and was a world boxing champion.
Muhammad Ali is a retired American boxer and three-time World Heavyweight Champion, who is widely considered one of the greatest heavyweight championship boxers of all time.
Muhammad Ali was world champion in Boxing on three different occasions (Heavyweight Champion 1964-67, 1974-78, 1978-79)and also won a Gold in 1960 Summer Olympics in Rome as an amateur (Lightweight).
Ali was the first three time world heavyweight champion.