How long after jaw surgery did everyone start working out again, going running or hitting the weights?
Most surgeons will strongly urge surgery patients to walk. Early and often - - and walk as vigorously as the patient is comfortable - - as soon as possible after most surgeries (obvious exceptions for things like a broken leg !)
Walking as soon as possible after anesthesia and frequently thereafter is the best thing patients can do to help themselves.
Avoiding things like weight lifting - - which involve a lot of tension in even collateral muscle groups - - is likely appropriate. But walking - - a lot of walking - - is really good for post op patients.