Hello, If you are morbidly obese , meaning weight double of your ideal weight, or Body mass index of 40 or above, you should prefer bariatric surgery to lose weight. You will lose a lot of weight through that surgery and that will be beneficial for overall health, like if you have pain in knee joints, diabetes, sleep apnoea etc. After an year or more , loose skin can be removed by tummy tuck . As you lose weight, your mobility will improve starting from 1-2 months after bariatric surgery as the flap will get lighter. Sometimes in selected cases , without bariatric surgery- just a plastic surgery is done. Surgery is called Panniculectomy . It helps remove only the hanging fat.