Seconded. Key for exercise: Find something that doesn't bore you to death. If most kinds of exercise do, you're not alone. Me, I get immensely bored of any generic cardio pretty quickly. I found the solution by chance: Bring a book while doing exercise bike. I can only read at about 60-70% of normal speed, and can only go 50-70% intensity, but I can do a couple hours of light/medium cardio while reading a good book. Weighttraining, martial arts, fencing, ultimate frisbee, golf, snowboarding, scubadiving, and occasionally pickup games of whatever in the snow have appealed to me. That might sound like a lot of activities, but I've tried dozens more and had them "not do it for me" and was bored or didn't enjoy them.
Eventually I found what works for me: things where I can think about tactics as I play or are played in really beautiful nature. Weight training also surprised me in how much I liked it once I got into it. Things without tactics or nature usually don't do it for me, but everyone's different and get into different things. Some people like to turn their mind off during exercise, some people like being really stimulated or distracted. Trial and error, plus not being discouraged if you dislike the first x kinds of exercise you try is the way.
Another way to make exercise interesting is to do something interesting while doing it. I ran into a friend recently who had lost a lot of weight. He said it was simply from using an elliptical machine while he read email. This seemed a very clever way to take advantage of the excessive amount of time one ends up spending on email.
Eventually I found what works for me: things where I can think about tactics as I play or are played in really beautiful nature. Weight training also surprised me in how much I liked it once I got into it. Things without tactics or nature usually don't do it for me, but everyone's different and get into different things. Some people like to turn their mind off during exercise, some people like being really stimulated or distracted. Trial and error, plus not being discouraged if you dislike the first x kinds of exercise you try is the way.