Kumble shouldn't interfere with Kohli's spirit and approach. He must also guard against rahuuul draaavvid & greag chappal from seeking back-door entry into the Indian as advisers or whatever!
Even if you are a retired cricketer,you can still try to spend an hour to improve your physique and fitness. Take a couple of rounds in the ground with the boys when he boys train. Just look at Gary Kirsten.