Once he is done the Atkins diet he may want to try something like Body for Life. It is pretty easy and includes weight training, some cardio, and a diet of high protien, low refined carbs and low fat (5-6 small meals a day). Maintaining is easy since the meal plans are just health eating meals with one day a week where you get to binge.

I am also very jelouse that he is taking Krav Maga :P. My friend has been doing it for a while now and she looks amazing. Plus i am sure she can kick a muggers arse from here to timbucktwo!!