@movewithalyna
One of my favourite posterior chain exercises π The Roman Chair back Hip extension
Itβs so important we train our spine in extension and flexion (in the lateral and sagittal plane) - making sure we start small and progressively load. Doing this will your glutes directly target the erector spinae muscles.
Make sure you get help from a qualified profession before trying this yourself, defo do NOT load this until you have built up tolerance.