No, I mean SS. I own 2nd and 3rd editions of the book and followed the program for 14 months. I remember the copious warmup sets. It's not the constantly high, frenetic workout like Xfit, but the blow-out effort for the 1x5 deadlifts where your face turns beet red is as far from endurance training as you can get. 10 minutes of warmup sets capped by a few high-intensity sets isn't endurance, 2 hours of running with light breathing is. You see this in comparing the physiques of elite strength vs endurance athletes.