I was reminded of this picture because I went back to bikram tonight after nearly 6 weeks off.
Mr Z took this when we were on holiday at Lake Tahoe last month (so I'm not throwing back very far). Every time I was in water this summer I took the opportunity to work on this pose, since the water did some balancing for me and allowed me to easily grab my ankle from the inside. At this point I was balancing on a rock to keep my chin above water. It was extremely cold but I persevered for quite some time: the activity made me warmer.
You'd think, with all the practising, that I would have got on alright this evening, but you would not be correct. At least I went back.