Hi MariJane!
Me too! But I have found that they seem to be in a shrinking trend. I KNOW they're going to get smaller because my fat is getting looser. I just have to be (relatively) patient.
If you have yo-yo dieted, and your profile says you have, your body is probably very good at saving its precious fat stores. Which means it may take a while, but you will eventually see progress. Besides, you know you're getting healthier by exercising, right?
It may also be partly the way we're built. I have always (except as a rake-thin child) had stocky legs. So they will probably always be a little on the stocky side, no matter how good my level of fitness is.
One caveat, though, looking at your amount of exercise: an hour and a half every day (or even
most days) is a lot. Your body will hold onto your fat that much harder if you're overdoing it. That's because it regulates your metabolism to make you more efficient at the exercise, and save whatever calories it can. A little more rest can help this and prevent overtraining syndrome. Also, taking in enough calories will keep it from over-reacting.
I don't know if any of that helps, but I'm very interested to see other responses too. Always looking for the magic pill.