You lead a harried, stressful life. I hate exercise. Don't do anything you dislike. Ask yourself what kinds of physical activities you like, and simply do them more often. I don't have big blocks of time to exercise.
Sporadic exercise adds up.
If you take just three 10-minute walks a day during breaks, you're exercising 30 minutes. Just walk a little more briskly while shopping or golfing. For every year you've been out of shape, it takes about a month to get back in shape. It takes about eight weeks to start feeling the physical and emotional benefits of exercise, and three or four months of consistent exercise to notice weight loss. But if you stick with it, you'll lose weight.