I’ve recently discovered the works of Stu McGill, after being diagnosed with a flexion intolerant spine by my physio. He recommended to do the McGill 3 (bird-dog, side planks, McGill crunch), and to avoid situps/standard crunches and flexion under load.
What I am less clear about is that else I should be avoiding. Are knee-raises ok? Are back extension exercises ok? Whilst not technically flexion under load, they replicate the movement of a crunch, so would like some clarity on what I should avoid.
Also, are there any resources to plan a workout regime for the flexion intolerant spine?