I prefer that my patients stay active and in fact require that you are up and walking around the evening of surgery.  Light exercise can begin after several days, not including chest-specific weight training though.  All restrictions are removed after six weeks, and sometimes even earlier depending on your personal progress.  It is important to follow all instructions during the early postoperative period to ensure excellent results.  I always remind my patients that they went through the effort to have the surgery and to give themselves the proper time to recover.