Flexibility and mobility aren't the same thing. Flexibility is just reaching a position with gravity's help. Mobility means moving into that position while controlling and strengthening your joint at the end range. Build it by targeting the muscles around the joint.
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How would someone add mobility to certain joints? There's a difference between flexibility and mobility. Flexibility is passive range of motion. Let's just say I can get myself into a split and I'm using gravity to pull me down and I have something there that kind of keeps me there. With mobility, it's active range of motion. So being able to get into position and be strong in that end range, that's more important than flexibility. So when you're talking about hip mobility, in a sense, I will get into ranges of motion, whether it be standing, seated, whatever it is. If they have the ability to do that with balance, I'm going to get them to a joint range to where they have less full control, and I want to stimulate muscle that surrounds that joint to help increase the joint—