It seems to me to be an advert on how to get sore boobs. (I'm not an expert or anything.) If she was wasn't riding then it would be kinda gratuitous (a la Marzocchi catlogues, Monster Energy girls, UCI trophy presentations). In this case it's just dumb fun. Ladies - Strap Up and Stay comfy. Shame she doesn't get a credit - I'm sure there are companies who would consider her riding talents enough to be worthy of support.