Legs - no gym

I'm really trying to target my legs. I walk and run a lot, I ride horses and I have a yoga membership, but no formal gym. I have 5-25 lb dumbbells at home, and lately I've been doing squats and lunges with the added weights of dumbbells.

I'm wondering if there are a larger variety of leg exercises I can do besides the obvious. Any videos or sites you can recommend would be great!

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