With someone with a herniated disc or disc bulge in the back region, what one exercise is contraindicated?

Oopsy! In exercise physiology world loaded flexion and rotation is contraindicated full stop, not just for those with disc herniation. Dr. Stuart McGill taught me that, not personally, but his research.

I thought you were looking for something really different. You will notice, though, that I reference the cause of the herniation in the last sentence of my post.

Thank you Chris, for challenging us with such thought-provoking questions. It, encourages me personally to continue to be proactive about educating myself.

Best!