I've gone through phases of exercising...lots of them, but never seem to stick to it. I've joined gyms twice, pre-kids, and quite enjoyed it, but the cost puts me off now, and the having to fit it into certain times. I do used to love doing the weight machines, but hated cardio. I've done endless exercise DVDs and stuck with them for a few weeks, but never for long. My best was yoga last year, went three times a week for 8 months and loved it, but it is expensive and I just can't get back into the habit.
Long list of failures...that's why I'm so impressed with your success!