Sthenia means having a lot of strength or energy.
Sthenia is a good thing, like being a superhero.
Examples:
He has a lot of sthenia.
The superhero's sthenia helps him save the day.
Sthenia is important for lifting heavy things.
I wish I had sthenia like a superhero!
With sthenia, you could lift a car!
Sthenia is like having superpowers.