Inner thighs to start. I
Inner thighs to start. I have an adorable running skirt with a built in compression short that is too short. It rides up leaving my inner thighs bare and chaffing. OUCH! Bras can chafe in all kinds of places. When I ran the 24 hour relay I held up my body glide and offered it around to the team. The gal that is training for an iron man, and ran 50 miles in 12 hours, practaclly lunged at me saying, "Thank you!!!" as she stuffed it down the front of her shirt. Her sports bra was chaffing her chest in upper front, LOL.
When I ran my second half marathon, and actually cared about my time instead of just finishing, I had chafing in places I never dreamed. Between butt cheeks is one, but pretty much the whole area between my legs (where the cotton crotch would be in a pair of standard panties) was raw! My friends and I were camped at the KOA and after the race all hit the showers. I was just thinking, "OMG, I shouldn't have shaved"
when I heard my friend in the next shower stall yelping, "OMG, I should have shaved!" So neither aproach helped. For my next HM I Body Glided every possible surface and was fine. Same for the marathon, although I still had a bit of chafing after that, but it was little enough to be gone in a day or so.
Oh yea, and belly button. I have a couple of shorts and tights that hit me right at the belly button. I've come home from a long run with my belly button actually bleeding, OUCH! And I have an innie!
Edited to add, when you need to protect from chafing depends on a combination of heat, sweat, time, and humidity. Everyone's skin is different too, so it is a game of trial and error