Under Armour To Announce Signing Of Muhammad Ali [VIDEO]

You know that you're truly one of the greatest of all time when you're still relevant over 30 years after your retirement.

Muhammad Ali announced his retirement in 1979 but on Tuesday it will be announced that he has signed with Under Armour.

Ali, 73 years old, was hospitalized last December for a case of pneumonia. Within days, it was reported that Ali had "vastly improved."