At least half of the reason I go to yoga is to do hip stretches (and work out the IT Band kinks). If I don’t have time to yoga, I will almost always do bound side angle, dragon, and pigeon after working out to keep myself limber (occasionally, if no one is around, and it’s an odd hour, I will do these in the steam room at the gym, which feels awesome but would be incredibly awkward to have someone else walk in on).
Add to these a new one: The Russian Baby Maker. Click the link, I can’t do it justice.