I’ve always wondered, if your character (Or anyone, really) had the regeneration mutation / hyper metabolism, that is, you repair damage to your body extremely quickly, would it be possible to use this to weight train your body to superhuman limits? I’m assuming this is possible b/c the muscles are getting repaired basically right as they’re exhibiting micro tears, so theoretically you can get stronger much much faster than if you were normal.
Other factors like myostatin may skew the results if this was real, but i’m talking in general.