How would i make my characters arms or upper torso rotate for a third person shooter?

so im making a third person shooter and i have an aim animation how would i go upon making it aim up and down? here is a gyazo gif showing what i mean, side to side is fine but up and down is not existant lol. https://gyazo.com/3988ba6f515dfdfeea86b68de5baaf5a