<s>[INST] I had my left kidney removed due to stage 3 cancer   10 weeks ago. For the last 5 weeks, I have been walking 3 miles a day in 40 to 45 mins ( I used to jog and have exercised all of my adult life) however my stomach is still flabby and I feel fat. Weight loss was not one of my symptoms. When can I resume sit ups, weight training etc. I am an English speaker in a Spanish speaking country so it is hard for me to get advice. [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. It is better to avoid physical exertion and lifting objects for five to six months after a major surgery like nephrectomy. You can get back to physical training, like sit ups after five to six months after discussing with your urologist. Gradually increase the level of exercises and you can get back to normal life and activities over a few months. Wishing you good health. Thanks. </s>