Tightness after SL PE1

The day after SL PE1 (number of sets/reps is close to mastery) I feel very tight in the lower back/sides. It really is more tightness than doms. Are those the lats which are tight? I think they are the same muscles which one stretches in the shoulder pancake. Any mobility/stretching particularly recommended?

RC/PE2>im. Stretch into the shoulder to which you're leaning (leaning to the right side, stretch the right shoulder/lat). Try to get your arms and torso in a line. It can be pretty intense.

Thanks Daniel, I'll try that.

Also, remember to have your eyes follow the weight in your hands. You want the movement to be an oblique twist and not shoulder rotation. If you head/eyes stay facing forward then you will likely feel it more in the shoulders and back. I have tight lats and shoulders so I know that I'm not turning my head/spine enough if I start to feel it in the wrong places.

Ok, they day after was definitely lats, I'll pay more attention to where I feel it during the workout next time.