The three areas of a well-rounded warm up include mobility work, purposeful stability and coordination exercises, and a few dynamic barbell movements prior to adding weight to the bar. Of these, foam rolling and sitting in a deep bodyweight squat are two of my favorites. Foam rolling has been shown in research to improve your mobility without any decreases in muscular performance. Sitting in a deep bodyweight squat helps establish a stable and strong bottom position, which is crucial when attempting to lift heavier weights. I would sit in the bottom of the deep squat for around 1 minute and if needed the athlete can hold onto a kettle bell or weighted plate to help offset their balance and sit comfortably.