Your patella has been broken for half a year, and now you can do functional exercise. Usually squat in groups of 30 at a time. Should the exercise time be 15-30 minutes, or "sweating is the most important"? Pay attention to step by step and gradually increase the code. The method is to put your feet together, keep your whole body upright, focus on the palm of your front foot, including your chest and abdomen, relax your whole body, don't lean back and tilt your head, always keep your legs together, try to keep your knees within your toes when you squat, and then get up slowly after you squat completely. I wish you a speedy recovery!