General exhalations:
* "Hhh" - A simple, quiet exhale
* "Ah" - A longer, deeper exhale
* "Whew" - A sigh of relief or exhaustion
* "Pffft" - A sharp, quick exhale
More specific exhalations:
* "Sss" - A hissing sound like a snake
* "Shhh" - A quiet, calming exhale
* "Oof" - A heavy exhale often associated with exertion
* "Sigh" - A word to describe the action of exhaling, but not the sound itself
Ultimately, the best way to write out the sound of an exhale is to use the word or sound that best captures the specific context and intention.