workout stench- how standard is this?

[SNOWBALL]

I joined a gym a few days ago, and have been going every day. Yesterday was just yoga though, because I don't want to burn myself out.

Anyway, today, I was working especially hard with a personal trainer (I get 1 free session for joining), and I began to smell...awful. It wasn't just B.O. either. I could smell my own butt. It was terrible. No one said anything, so I just kept going. I seriously hope this doesn't happen again.

Yes, yes. I change my underwear every day and shower.