I can remember starting out doing C25K as part of my weight loss project around the time of Michael Mosley's The Truth About Exercise. It would have been dead easy to give up in the face of what everyone was talking about as it seemed I was wasting my time. Yet I knew that the really intensive kind of exercise suggested there was a recipe for making myself very, very ill indeed. So I kept going for a laugh really - I knew perfectly well that those 8 minutes of running which was the total run time of the first week were not going to be burning up loads of calories.
I also started parking further away in the supermarket car park and pushing the trolley quite fast to and from the store.
I've never been a yo yo dieter, or even a dieter, but about 10 years ago I needed to lose weight and I did it, but I wasn't well enough to do as much exercise as I can and do now (even though I still have to spend most of my time in bed) and it was hard going. The exercise I do rarely burns me more than 200 calories and not every day but I really believe it helps.