IU claims that her calves thickened from all the dance practice for 'The Red Shoes'

IU is in full promotional mode making the rounds on the radio programs to promote her album, 'Modern Times'. On October 17, she appeared on SBS's 'Cultwo Show' to talk about her comeback.  

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DJ Jung Chan Woo said, "Your new song 'The Red Shoes' reached number one on the charts as soon as it was released.  On one hand, it feels like watching a musical.  On the other hand, the song seems kind of long.. Isn't it hard for you?"

IU said, "It's hard.  There's the song, but there's also the dance in which I need to don red shoes and dance however I want just like the lyrics say so it's hard.  Because I practiced a lot, my calves got a lot thicker."

Jung Chan Woo said, "This is thick?  What are you talking about?  Looks like you need to practice a lot more from now on, then," making IU laugh.

It does not appear that IU needs to worry at all as her legs still appear as slim and pretty as ever.