physical fitness vs fitness

physical fitness and fitness both are nouns.

Word	Noun	Adjective	Verb	Adverb
physical fitness	Yes	No	No	No
fitness	Yes	No	No	No

As nouns, physical fitness and fitness are synonyms defined as:

physical fitness and fitness: good physical condition; being in shape or in condition

physical fitness (noun)	fitness (noun)
good physical condition; being in shape or in condition	the quality of being suitable
	the quality of being qualified
	good physical condition; being in shape or in condition