Bad at any pose that involves putting my foot behind my head
This means my practice includes nothing that would technically be considered an advanced asana. Foot behind the head is the cherry on top for yoga poses. To me, it's just not worth it. Even with the potential benefits for my social life. Being a recovering perfectionist n' all, this mediocrity is good for me.
Despite years of trying, the foot-behind-head situation happened only once. In 2010 at an Ashtanga workshop. A visiting teacher tried like hell to get me into Konasana (ankles crossed behind head with hands clasped behind the back... it's as fucked up as it sounds). The poor teacher. He was determined to get me into that pose. He got both feet awkwardly behind my head but then they sprang apart when he tried to make my hands to clasp behind my back. It went back and forth like this for awhile before he conceded defeat. I wasn't really involved in this process. I was like a bystander watching my own body be morphed into the shape of a Christmas turkey.
My decision to cut these poses loose came around the same time I owned up to not being able to get through an ashtanga practice without taking an Advil first. My poor hamstring attachments were wrecked. I still have to watch out for them. That's not a diss on Ashtanga, just my approach to it.
Anatomically, the whole foot behind head situation is kinda messed up. Let's just leave it at that. Some people can do it easy-peesy. Some of us cannot. The question I think we should ask ourselves is, "Do any of us really need to be doing it?"