I have worked with a lot of obese individuals and the best answer I have at this point is… movement! I know, its not elaborate but it is my experience that the action itself isn’t as important as the the consistency of doing, well, anything. I had a client lose their first 30 lbs just by clapping and stomping their feet. Make it fun, keep it simple, and alway educate them along the way.
Training their mind so they actually believe a healthier life can be theirs! They’ll need to devise healthy routines for eating, exercise, sleep, support, stress-relief, and then implement consistently for life. Hopefully, they’ll have some good contacts from which to start the process so that their road won’t be any bumpier than necessary.
There is not one exercise that will work in this case. I believe that better diet, more education, support, more activity (including cardiovascular and strength training) and help them understand where their actions have led them, and what is going to happen to them if they don’t change attitude (starting with the way they think) are the keys of success here.