Different doctors have different theories. Some (including Mitkovic) believe that additional muscles do not impact your recovery. Guichet thinks that additional muscles can
improve your recovery. Most doctors agree that its not good to be on the two extremes - either too much muscles or too few. Too much muscles make you too heavy and you dont want to be too heavy. Too few muscles mean that...well basically there will be no muscles left to cover the new bone
And distracting would be more difficult. If you have too little of sth, its more difficult to stretch it.
Most people here are not athetes and nobody is a professional athlete. At most people go to the gym regularly and do lifting. You can do that after the surgery, most people rocover that. However, I am yet to come across a diary of a professoinal athlete who undertook LL. One thing is for certain though and that its, nobody recovers 100%. Even professional soccer player coming after injury, been taken care of by the best doctors in the world, even they do not play at 100%.