at rabbits!
One thing I found with my kids, is that if you are honest with them, they are more receptive and perceptive than we give them credit for.
So, anyway, not every boy is meant to be a big ole, he man athlete like John Elway or Michael Jordan. I mean where would we be without Steve Jobs and Bill Gates and (sarcasm ahead) ole what's his bucket the politician who claims to have invented the internet?
But good health, nutrition and some form of physical activity is important, so that you can enjoy the people and things you love and live a happy life, whether you are Hulk Hogan or Super Geek.
So, maybe have a "visit" "with" him, instead of talking "to, at, over or around" him. Allow him to help with the decisions. I think he'll feel much better if he can have an active part in the process and understand that you don't expect him to be like his brother or anyone else. That you just want him to be healthy and happy.

Just my 2 cents worth.



I'm not sure where you live, but walking on the beach collecting shells or looking in rock pools was also heaps of fun. "Going for a walk" was always a chore, but going to the beach for a look in the rock pools and to poke the sea anemones was a treat 
. The tougher courses have actually quite a lot of hill climbing incorporated, so you get some good "moving around" exercise.