The lunges were freakin' laughable unless they were walking into a 60-mile an hour headwind. To be fair, the clip of the lunges was very short.
As far as the (half) squats and leg presses, you guys aren't being very fair by not mentioning that they're doing 20-rep sets. Half-squats or not, 20 reps is WORK. (Besides, if Branch does fulls for 20, I'm pretty sure he'd have a heart attack.)