Posts on the internet discuss this topic- the short answer is… the SQUAT, no question. More specifically, the gravity squat. There are over 100 factors of progression in the squat exercise making it one of the most neurologically challenging exercises to master. To squat properly is to manage all the axis of rotation in every joint of your body through movement. The bottom of the dead lift actually allows for more trunk flexion which in fact is easier to do then to maintain the gravity line and pelvis through the total range.