The Phantom has the Strength of Ten Tigers - Old Jungle Saying
The Phantom has the strength of ten tigers which is an Old Jungle Saying. While the Phantom is a normal human man without super powers, he is stronger than the normal person.
He is super fit and trained in various methods of fighting by his father but also training by professionals around the world and the jungle. While he is strong and can mix it with heavyweight boxers, he is also athletic enough to outrun a deer and outswim a crocodile or shark.