How do YOU train your ankle flexibility so it can do this on the picture? 
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Is that couch made of stone? Damn that looks painful!
Oops, that didn’t answer your question. Listen dude, just stretch your ankle. Yeah, I bet you were expecting a better answer than that, right? But what if someone posted asking “how do i strech to be able to do the splits?” Well, I would say practice doing the splits!
Just stretch your ankles a little each day. Don’t neglect them while you focus on stretching your other muscles.
Iron