Back extensions mentioned in PPST3 (p87) but not in SSBBT3
I noticed that back extensions were mentioned several times along with chin ups in the novice chapter as an exercise to rotate in with deads and cleans, so that sent me searching in SSBBT3 to see if there's an explanation of how to properly perform them but I didn't find anything in the index under Back or Extension.
Are they as simple as they seem? I'm tempted to assume so, but once upon a time, I though squats and deads were as simple as they seem, which suggests that my assumptions aren't always very reliable.