What are some exercises that will slim my legs, but not make the muscle bigger?

[littlebluebird]

I started doing exercises morning and night to slim and tone my body, but I noticed recently that the muscles on my legs are actually getting bigger. I was attempting to slim down my thighs, but my calves are getting bigger. Are there any quick, easy exercises that I could do morning and night that will slim my legs, but not make my muscles bigger? Thank you