'His muscles were made of steel' 

is an exaggerated sentence.

'He was strong.'

is a plain sentence.

'He hammered faster than lighting.' 

is an exaggerated sentence.

'He worked quickly.' 

is a plain sentence.

' He was ten feet tall.' 

is an exaggerated sentence.

'The dog was as big as a house.' 

is an exaggerated sentence.

'The dog was big.'

is a plain sentence.

'This car is as slow as a turtle.' 

is an exaggerated sentence.

'This car is slow.' 

is a plain sentence.

' My brother is fast.'  

is a plain sentence.

'My brother is as fast as a car.'

is an exaggerated sentence.

' My dad is tall.' 

 is a plain sentence.

'My dad is as tall as a house.'

is an exaggerated sentence.

This is real.

This is fantasy.