Glute Bridging technique

Heels close to bum. Tuck pelvis under to start, then drive the knees forwards and weight into the heels to lift. If you slide back into your shoulders lower and try again focusing on driving the heels down and knees forwards. If you feel discomfort in your low back lower and try again focusing on tucking the bum uber before lifting and not lifting so high that your back starts to arch and you lose the engagement of your glutes.