Anything above and beyond what he does not will help. I'd find something he enjoys are at least tolerates. If it's evening walks around the neighborhood, so be it. I'd also start really emphasizing the idea that you guys are doing this together. Talk about how good things will be once the weight is lost. This will create and maintain a positive frame of mind which in most cases will reinforce consistency.

If he starts walking, and assuming he keeps his diet in check, progress will ensue. Once he starts realizing that good stuff is happening, it will most likely translate into the desire to do more. At that time, he can step it up in terms of exercise and start walking further, using a bike, or whatever else he feels fit to do and wants.

It's all about setting up a plan for him.... and not making it something he must do or else. If you don't make it an enjoyable part of his lifestyle, there's no way in hell he's going to lose weight and keep it off.

Most importantly I think is linked to what I said above about the positive frame of mind. If he doesn't establish this, he's not going to adhere to your food plan. No way. Sure, he might eat what you make him for lunch and dinner. But you aren't watching 100% of the time and though he'll appease you by eating your meals, trust me, his he'll appease his natural desire to eat whatever he wants too!

On that note, don't be too restrictive in terms of diet. He's a big guy and can afford to eat a good bit. Caloric requirements are based on body weight. The more you weigh, the more you can eat. If you're too strict, I doubt he'll last long at all.

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