I have a friend who's trying to lose weight, so I invited her to go for a run with me this weekend. She said, "How about we walk instead? I don't want bulky thighs."
I'm sure a lot of people think that, since running does focus mostly on using your lower body. Don't worry though — it in no way will bulk up your quads into huge masses of muscle. Since running is a great way to burn calories (which is what you need to do if you're trying to lose weight), it'll actually help you lose fat from all over, including from your thighs and bum. So on the contrary, it'll help your thighs look slimmer, not bulkier. Running will also tone your booty, quads, hamstrings, calves, and shins, so once you start shedding pounds, it'll reveal sculpted and shapely muscles.
Fit's Tip: The same goes for biking and hiking. These cardio activities will burn calories and tone beautifully without adding bulk.