KEY COACHING POINTS:
Shoulder blades pinned back
Keep the bar close to your body
Core braced and spine neutral
Whilst maintaining a neutral spine, drive up by pressing the ground away from you then squeezing your glutes into the bar (don't hyperextend the lower back at the top)
Slowly control the movement back down by driving your hips back(hinge at the hips) and slightly squatting
Once the weight is dead to the ground you can repeat