This program was initially developed as supplemental work for track and field athletes to keep them healthy between intensive running sessions. (blog.trainheroic.com)
You can choose what movements you want to perform to support the primary lifts via supplemental work. (heaveyduty.com)
Some people may feel that the spinal erectors need tons of supplemental work in order to progress ones squat / dead, but I disagree. (lift-run-bang.com)