Answer:
What you become during a workout?
What is used to yell in a text?
Passed from father to son and shared between brothers, its importance is unquestioned though it is used more by others.
Timid or weak people are said to not have these.
What always comes into the house through the keyhole?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?