Ok, how do you do these? I can currently sit on the floor in a straddle between 90-120 degrees, but getting to 180 degrees seems pretty impossible. I've had this same level of flexibility for years, even though I've since obtained the front-to-back splits and frequently work the "pancake" stretch. I really just have no idea how to stretch this one.
Right now, I'd be happy with the static passive flexibility, though I'd eventually like to be able to hold it as a static active position for handbalancing.
And yes, I'm actually holding that handstand. Get on my level.