Don't get me wrong, exercise is good for your overall health. Very good. You should get 20-30 minutes of strenuous exercise three to five times a week for cardiovascular health. But as far as weight loss is concerned, that comes down to diet. You can still be fairly overweight while getting that much exercise, if you don't clean up your diet. I'm a perfect example of that!
On that topic, it really is surprising what even small changes can do. I'm very much a creature of routine, and my breakfast routine has been three fried eggs, a glass of skim milk, and two pieces of toast with butter. Like clockwork, that's what I eat. Keeping lunch/dinners reasonably the same, I took the toast out and started making omelettes with peppers, green onions, and a very small amount of cheese instead a 10 days ago (still with 3 eggs), and I'm already down 2-3 pounds. That's combined with a couple decent cardio workouts over and above my usual stuff. Hopefully that keeps up.
I don't have any huge weight loss goal. I've slowly crept up to about 195 the past couple years, so I'd like to just creep back down to 175-180 over the summer. I've got a 24 Hours of Adrenaline bike relay rice middle of July that I'd like to be in better shape for than I was last year, but I'm only about 5 pounds away from my weight last year, so I should easily beat that. I just wish the weather would turn here so I can start going for runs and bike rides on a regular basis, but it was fucking snowing and 0C over the weekend. Fuck that, I get ear aches from that shit!