Hey I have a great idea for gym etiquette. How about lay OFF the perfume? Or choose a treadmill not next to mine. Especially when I am at the end of a 30 minute running session and cannot move to the other side of the room to avoid asphyxiation.
And guess what else! Rolling around in a puddle of Walgreens Rose perfume and then dumping patchouli over your head does not make a great combination. In fact, neither is a positive aroma.
In addition- you didn't even break a sweat while walking s l o w l y on your treadmill and talking to your fancy make-up friend. So the armpit swipes of deodorant would for sure suffice. Perhaps you had your period and feared the fishy odor, in such a case a simple light body spray in nether regions would ease your fears.
.....just in case my coughing and turning purple didn't give you a clue.