I'm completely obsessed with mobility, so I'm always exploring on my mat, finding new ways to make my hips happy. My latest exercise I adore is weighted hip rolls; you can improve lower-body mobility, release tension from your hips and strengthen your core, hip flexors and legs.
You don't need much; I recommend one of the best yoga mats to sit on and either a weight plate, dumbbell, or loop band, or a combination of all three. This mobility exercise is low-impact on your knees, but if you experience pain, stop immediately. If you’re currently injured, I advise clearing new exercises with a qualified medical professional like your physician first.