3. Low Bun
When in doubt, pull your hair back into a low chignon bun at the nap of your neck. It works for a happy hour or a work meeting, and looks classic and sophisticated, and the best part is you just need a brush and some bobby pins to hold it in place. And you can even smooth down hair with a gel or spray, which means your sweaty gym hair will look intentionally plastered to your head. Nailed it.