Third PSA: deodorant smells fucking awful. I would rather smell your natural stink, though I'd most prefer if you just bathed regularly.
Fourth PSA: your surface microbiome can be cultivated through diet and washing habits. If you have a healthy lifestyle, your pit stink will be mild even when you've been exercising. (However, your microbiome is inherited from your parents, so if they were disgusting, you might need probiotics)