I advise my patients they may return to the gym at three weeks for activities like lower body weights, running, aerobics, and swimming. To determine what level of activity is right for you, you should listen to your body and see if there is any discomfort. This should be your guideline for your level of activity. For upper body weights and activity, patients report that they are more comfortable closer to six weeks. It's ways best to check with your surgeon's postoperative protocol. Hope this information is helpful. For more information on this and similar topics, I recommend a plastic surgery Q&A book like "The Scoop On Breasts: A Plastic Surgeon Busts the Myths." Happy skiing.