Superfitness is a derived term of superfit.
As a noun superfitness
is the quality of being superfit; extreme fitness.
As an adjective superfit is
extremely fit, either physically or evolutionarily.
superfitness
English
Noun
(-)
The quality of being superfit; extreme fitness. superfit
English
Adjective
(
en adjective)
Extremely fit, either physically or evolutionarily
Derived terms
*superfitness