Lower Back Issue
Over the last year ive made some good strength gains following CFFB but ive also developed some back pain. One side of my lower back has developed a little bigger and is less flexible to stretch.
Ive tried to work out what it could be that im doing wrong but im stumped. I think it is the left erector spinae but i could be wrong. Trying stretching and mobility as much as possible but is there anything else i could be doing?