I've been watching So You Think You Can Dance, the British series on BBC1, and really loved this particular dance. It's the first time I think I have ever got teary when watching dancing.
It's about a woman who is battling breast cancer.
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Turns out the choreographer Tyce Diorio did the exact same dance originally on the American series of SYTYCD. But having seen both, I think prefer this one. Mostly, I think, because Charlie seems to have so much emotion when dancing it. Both her and Robbie (along with the judges (and I imagine the audience)) were all teary after finishing the dance because it was so emotionally demanding to do.