Hip mobility is kind of a big deal. When the hips do not move like they are supposed to, the knees and low back get crushed, you gait starts to change and everyday activities become far more challenging than they need to be.
It is only a matter of time until one, or both, of them start to hurt.
The good news, with a little bit of work you can maintain, of get back, your hip mobility.
One of the ways we can do this is with the Spiderman stretch. I have it on good authority that this is, in fact, how Spiderman maintains his ability to scale walls and look super limber doing it.
Start with the first position and see how it feels. If you are getting a mild-to-moderate stretch in the glute area on the front leg and the front of the hip on the back leg, then do not progress.
The video below has the initial position and two progressions.