Vigor
Part of speech: noun
Definition: Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; energy.
Example sentence: In nonviolence you must go full steam ahead, if you want the good to come speedily you must go about it with vigor.
Muscularity
Part of speech: noun
Definition: musculatureThe degree to which the muscles in a body part are developed.