Currently doing BGB. My rack pulls start at mid-shin.
I didn't have any trouble performing my 5x5. At the end my lower back was tight (not sure how to describe it). It was kind of awkward to move around and unrack the weights. I wanted to sit down and get off my feet. I went ahead to my next exercise, seated calf raises, and by the time I finished the 1st set I was fine.
What was up with my lower back? Could it possibly be my form? It's been 6hrs since then and my back isn't bothering me. This happened last week and didn't have any back problems then either, just that temporary tightness (maybe pump?) in the lower back for a couple minutes after finishing my rack pulls.