In English there are no masculine or feminine forms. English uses gender specific nouns for male or female, such as male and female.
The noun 'exercise' is a neuter noun, a word for a thing that has no gender.
English does not have noun genders in most cases. Exercise is neither masculine nor feminine.
feminin
masculin
its masculine
Feminin.
feminine
feminin
chica is feminine
masculin
The word "chateau" is masculine in French.
feminin
feminine
it is feminin
feminin
le pain