Lately I have been having the urge while in Halasana (Plough Pose) to do Bastrika Pranayam. The past few days I have indulged in this urge. What I have found is an intensely ecstatic practice. The forced Jalandhara caused in this pose accompanied with the deep stretch of the spinal nerve and automatic uddiyanna bandha is incredibly pleasurable and I believe purifying as well. As with everything else remember to watch for overloads and pace yourself, but I thought I would throw this out there as I find myself looking forward to this practice in my routine due to the ecstatic nature of it. Hope others enjoy as well.