How do I slim down my legs with indoor exercises?

PeachSunset
Ok I think my title is self explanatory. My legs aren't fat and i'm not heading towards a huge thigh gap, but I think I want them thinner, no, i'm sure I do. I know that stuff like biking, running, etc will help make your legs, especially your thighs thinner but is there any indoor exercise that can do that like when its late at night or if its too hot to go outside. by the way I don't have a treadmill. Thanks!
How do I slim down my legs with indoor exercises?
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