This is the reality of training for a marathon – CHAFING. It sucks people, but I am not here to lie to you. There will be chafing.
Before training for a full mary I had ran 13 miles many times. I had experienced some irritation, but nothing really bothersome (I don’t think it’s necessary to get into the details, you’re welcome). For some reason when I ran 15 miles for the first time I had the worst chafing on my chest right where the top of my sports bra touches my skin. I didn’t even realize until I got back home and stepped into the shower. The second the hot water hit my chest I realized – my skin was completely raw! It stung and burned so bad! It was painful ;( Boo. I had a very red and inflamed rash for a few days afterwards too.
Lesson to keep – that sports bra is no good for long runs.