Because Christian and I enjoy learning, we attended a seminar at Surge To New Levels gym in Carol Stream, IL. Trevor Jaffe and Greg Panora spent some time going over programming and then critiqued everyone on the squat, bench and deadlift.
Trevor talked extensively about working on only one cue at a time, but in a short 2 minutes, we tweaked 2 things.
Thoracic extension (with head down) and pelvis tucking.
Have a watch!