It's one of my favorite poses. I wonder why this pose is so easy for me. My explanation: I usually sit in half lotus pose on every chair. My knees fall to the side and this is very comfortable to me. This might be the reason.
It's a core pose of the first Ashtanga series. I enjoy that I've at least one pose that is easy for me. It's cosy for me to do it.
There is baddha konasana A, B and C. The picture shows A, B is with a rounded back and the top of the head is close to the feet. C is sitting upright.