I recently watched Fiji's video on Vinyasa for lower back care: Alignment.
She shows upward dog with the block between the thighs and states that the idea is trying to lift the block up away from the floor, creating a gentle angle to the back.
I just want to clarify this. There are few different yoga teachers I refer to, but whenever there is a discrepancy, I turn to Fiji's advice. In another youtube video I was watching, there was an instructor who was doing sphynx, then cobra and then moved in to downward dog, but said to 'perform your deepes/fullest expression of upward dog'. So from this, I sort of thought that a perfect upward dog has the most back extension/backward flexion that you can do. But if I understand correctly, this is NOT what Fiji was saying, and that upward dog should be a gentle angle of your spine, with the lower back as stable as possible using the lower abs and that lift of the legs away from the floor?