How to strenghten/tone lower body when have knee pain

I am 19 and have been suffering with regular knee and ankle pain since I was 12 because I'm a dancer. I can not find any exercises to tone/strengthen my thighs, quads, calves, or butt that does not hurt my knees and/or ankles. I'm talking ANYTHING... no exercises for them are painless for me. Any suggestions for exercises that you know that might not cause me pain will be helpful.
 
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