That's not silly at all. I'm a hairstylist AND an avid cyclist, and I wouldn't be offended in the least. She (he) may appreciate you letting her know your plans and, as others here have stated, giving her a chance to make suggestions (if that's what you would like). I'm always grateful when a client lets me know she is on her way to swimming, cycling, running, etc. and doesn't want it styled. It saves me the extra effort and products and gets her out the door faster with cleaner hair she doesn't have to feel bad about messing up. Of course for those who want it styled before exercising, I'm happy to oblige them too