Is rollerblading building my lower body up?

Recently, as summer started I started first to jog and then to rollerblade. I’ve gained about 7 – 10 lbs and I know a lot of it is muscle because my lower body is massive and my legs and butt are hard rather than being soft and jiggly (so I know it’s muscle). The problem is I do not want this kind of body because it’s harder with big legs to fit into jeans.

Is it possible to build up this muscle through rollerblading? (Keep in mind I do 4 times a week for an hr and a half, and over half of that is almost consistent uphill). I noticed that as the muscles began to get bigger the blading became easier and more fluent, so I associated the growth with it.

I want to cut down on the rollerblading and do what I did when I was down to 135 and under—just walking for 45 min to an hr a day and modify my eating schedule to eliminate night time eating. Hopefully I want to ‘tone down’ some of this muscle. Or could the muscle be temporarily swollen because I’ve been doing workouts too often? (i.e. I’ll go 4 days in a row rollerblading for an hr and a half).