This exercise is often used at the beginning of a regular deadlift workout to activate the nervous system, but it has several benefits. It hits the core musculature and it's even a tremendous movement for the traps and lats.
Grab the bar in the center with one hand. If it feels unbalanced as you reach the knee, put it back down and reset. Keep the bar as close to your body as possible during the lift.
It's estimated that 80% of the population will someday experience adrenal fatigue. When it comes to lifers, the percentage is probably higher. Jimmy Smith gives you 10 signs of adrenal fatigue, along with how to fix what ails ya.