When doing the upper body workout (or lower body for that matter), is it important to follow the same body part order each time? For upper body, Chest, back, shoulder, bicep, tricep? Or can I mix it up?
The BFL Success Journal is slightly different on upper body from the BFL book. (the last two are switched, if I remember)
That being said, it's meant to be in order. The reason is the size of the muscles. You want your most explosive lifting to be done with your larger ones and that will be in the beginning. Also, doing smaller muscles typically also works the larger ones to which they're attached and that would compromise what you could then do with those larger.
If something you need isn't available right now then it's better to either choose another exercise for that body part or move to the next body part and then go back to the one you skipped, later.
© Abbott Laboratories,2013