If you think of exercise as a 60-minute commitment 3 times a week at the gym you're missing the point completely. If you think that going on a diet has something to do with nutrition you don't see the forest through the trees. It is a lifestyle. I know it sounds cliche but you have to find things you love to do.
When I was in Philadelphia during the Depression in 1930 or '31 I got a very sad job as a night watchman in a garage. The cars in the garage had been abandoned by their owners since they had lost their jobs and couldn't keep up the payments.