Back in the day when I was a big proponent of only doing exercises where you keep a neutral spine, I would get back pain after almost every BJJ class. However, I recently noticed that I haven't had any post-BJJ back pain in a long time.
I believe this is because the neutral-spine-only exercises that I had performing for a long time did not adequately adapt my tissues for positions in which my spine was often out of neutral alignment. For anyone that doesn't know, lack of neutral alignment is not an exception in BJJ, but the norm.
Anyways, that's all I have to say. Just another positive GB testimonial!
