Fitness is the opposite of Weakness. Weakness is the opposite of Energy. Energy is related to Faster. 
Modern is related to New. New is related to Year. Year is related to March. File is a type of March. 
Fitness <--Antonym--> Weakness <--Antonym--> Energy <--RelatedTo--> Faster 
Modern <--RelatedTo--> New <--RelatedTo--> Year <--RelatedTo--> March <--IsA-- File 