You can resume light exercise with an appropriately supportive bra around four weeks post-surgery. These exercises should be gentle, and you should avoid any exercises specifically targeting the muscles of the chest, as well as any high impact routines. One of the key concerns regarding exercise following breast augmentation exercises that specifically target the pectoralis major muscle. Since many implants are placed under this muscle, an incision must be made, and the muscle must then be repaired with sutures. This incision needs time to heal and form scar tissue before you can begin to exercise the muscle again. It is imperative that you give this incision a chance to heal before you begin rigorous exercise of any kind.