What is Shrek's real secret?

Shrek
Shrek
Shrek was based on a real human named Maurice Tillet, a Russian-born wrestler who primarily competed in France in the 1940s
Like the ogre, Maurice was treated like a monster, described as "a fierce monstrosity, not a human being, but a stone of brutality".

However, he was a man with a huge heart, extremely generous and intelligent.

His appearance was due to a condition called acromegaly, which is usually caused by a benign tumor and symptoms include enlargement of the face, hands and feet.

He lived to be 51 years old, exceeding the low life expectancies that doctors gave him.
What is Shrek's real secret?
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