Higher temperatures and sweat can break down the pheromones - but the degree to which that happens depends on which specific pheromones are in IS/A. I would say if you wanted to try it start with a single spray and see if it smells funky after your workout.
I agree with lawlercopter here. I think it will be just fine to use and the only issue is the break down of things and would try 1 spray to start and see what you think of if. It will diffuse much faster due to the higher body temps and sweating than normal.
I would be interested in hearing your results on this as I have read quite a few reports on men and using pheromones and the gym, I have not seen any from women though.
Sometimes I use pheromones to do sports (not necessarily at the gym) but I never tried IS-A. I usually wear something social, female friendly, as I do it normally with a group of women only.
What I can tell about IS-A and heat/sweat is that it starts smelling at some point. It’s that typical -none smell which some can’t stand while others don’t notice it at all.
I never got complains about the way I smell though, so maybe it’s just me being too self conscious.
So most of my hits actually happened in the lineup signing up for the gym! I walked into the line and there was a guy in front of me in line. He hasn’t seen me yet but as soon as I came up I could tell the pheros hit him. He was kind of cocking his head side to side for a bit, then he was trying to angle back in a sneaky way to see who was behind him. As soon as he saw me he flipped around and started conversation! It was hilarious. He kept finding excuses to keep the conversation going
Hit number 2 happened during hit #1. We were talking about how it was my first time at that gym and how I was gonna test it out. All of the sudden this guy came over out of no where and said “sorry I couldn’t help but overhear…” and proceeded to give me advice on asking for a free 5 day tester pass.
Then as I go up to the counter (after the in line guy told me to go ahead of him), I was with the front counter girl getting signed up and one of the other employees kept finding ways to talk to me (much to the annoyance of the girl trying to finish my application haha).
As soon as I got to the gym I definitely got a lot of looks but no hits. Probably because of the different environment. But it was definitely a fun first mones experience!