If you ever wanted to know what it takes to be as strong as The Mountain from Game of Thrones well then he's ready to share his secret. 

Hafthor Bjornsson has released his own brand of sparkling water that he says will make you strong like him.

It's a gas ad and showcases the comedic side of the strongman which isn't very apparent when he's crushing men's skulls in Game of Thrones. If we take anything away from this it's that he has real potential for a career in comedy. 

Before you ask, no this isn't an April Fool's video, Heavy Bubbles is a real brand which you can learn more about here