Buns: Take that ponytail and pin it up, either on top of your head or at the nape of your neck. Want to hide that hat hair after your workout? Wet it down and pin it up. Tidy or sloppy, you can rock any number of looks from "librarian" to "Red Carpet-worthy." How to Make a Bun
Simple Single Braid: A simple braid starting at the nape of your neck is quick and easy to do yourself. However, if you leave your hair like that the rest of the day, people may wonder if you've gone "earth mother" or even "sister wife."
French Braid: You can rock a French braid all day as a sophisticated style. Exercise might produce some fly-away strands, so you may need to rebraid it after your workout. I do my own French braid in just seconds. Video: How to French Braid. You can pin the tail end under for a tidy look, or wear it out.
Small Braids: Tiny braids all over you head is generally a look done in a salon. It works well for workouts, although you may want to gather them all together in a ponytail if they are long. Video: How to Style Small Braids
Cornrows: Cornrows are a unisex look that will keep your hair tidy for weeks, although it also is typically done in a salon. It's workout-friendly. Video: How to Braid Cornrows