I have had back pain as you describe when beginning SFQ as well as other forms of Qigong. I've found that it has to do with the way I am holding my body - somewhere I'm holding tension rather than being relaxed while in the posture you describe - it's my "idea" of what the posture should be rather than relaxing into it.
For me, I feel the energy blockage (pain, tension - however I am experiencing it) and then can adjust my body to a more relaxed position. Usually I find that I need to straighten my spine a little more, or I have tension in my shoulders by holding them up rather than allowing them to relax - resulting in a burning pain around my shoulder blades.
I'm not suggesting that the exact same thing will be true for you, but if you are gentle with yourself and listen to your body, you will find the truth of your pain.
Blessings,
Jenny
Blessings,
Jenny
