The members don't really have a chance to 表示する off their flexibility. I think the most they've shown it is in their Horror Movie Factory days (Episode 5). While watching, it's pretty obvious that Yuri, Sunny, and Hyoyeon are extremely flexible. I think Yuri's the most though. During the limbo, she competed against 2 shorter people LOL. Jessica is definitely the least flexible, followed によって Taeyeon.