I used to have this problem. I just focused really hard and stretched on my off leg for about 5 minutes straight, get up and kick a little bit, then stretch it again for another few minutes. It worked for me, and biegn ambidextrious helps too 
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“I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times.”
-Bruce Lee
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