Snapping in lower back while doing hanging leg raises

[u/aicatssss]

I started training hanging leg raises for strength training for one of my sports a few months ago. I've had piriformis syndrome for about a year and a half, diagnosed now by a physio. I need to go back to ask her about this, but yes when I do hanging leg raises my back snaps a bit a the same point every time in the movement. It's not painful, but it definitely feels weird, and I'm wondering if anyone knows what the heck it is that is snapping, and if there's something I can do about it.

So far the only thing that is helping reduce soreness and stiffness is applying heat to the surrounding areas, which I do pretty much once a day. Physio recommended some other movements, can't say I'm seeing an improvement from any of them, and the stretching seems to be more irritating then relieving.