The 90/90 stretch is great for hip and lower body flexibility!
Start sitting on the ground with one leg in front of your body, bent at 90 degrees
The other leg will be out to your side, also bent at 90 degrees
Keep your chest up and your shoulders back as you sit up tall
Keep your knees in place and put your weight on your front leg
Try and work forward so that you can get your elbows down on the ground and in front of your shin
After stretching forward, try to stretch the opposite muscles by transitioning your weight to the back and leaning backward