It's surprising how many people have tight hips (myself included). One of the best ways to reduce the tightness of the hips, and to increase the flexibility of the hip joints is to do stretches.
The following stretches are meant to open up your hips, and increase strength and flexibility:
If you've ever done yoga, you may recognize some of these stretches. I've tried 8 out of 10 of these and they feel unbelievable.
If you have tight hips, or are just looking for a good stretch (runners, these are great stretches for you) I highly recommend that you try these.