Why can i do this?!

Question: this isnt me, but i can do this with my shoulders... why is it that so few people can do it. what is the muscle or whatever that is different to lots of peoples??
http://youtube.com/watch?v=s9v6g3GSEsE

---

---

Answers: this isnt me, but i can do this with my shoulders... why is it that so few people can do it. what is the muscle or whatever that is different to lots of peoples??
http://youtube.com/watch?v=s9v6g3GSEsE

---

---

double jointed!! i would guess a lot of ppl rnt double jointed idk why some r beats me!! but stop doing that its freaky!! lol anyway yep hope this helped!! :D

---

---

---

---