Spine Hyper flexibility
I am pretty flexible thanks to a long time in the martial arts.
Although now I have a sneaking suspicion that my lower back is 'hyper flexible', and my hamstrings are not loose enough.
For example, I can drop to a back bridge hands touching the floor, and stand back up again (with some effort). I mostly feel a little discomfort in my lower back when I do this.
Now when i squat (air, back, front, whatever). I can drop low, keep my knees behind my toes, my hips go back. . . here is the weird thing - I can keep my torso verticle from my ribs up, but my lower back is at a very steep angle foward. Basically I feel like my back has a 'kink' in it.
When doing overhead work or heavy back squats, I always feel it in my lower back. Deadlifts I don't have a problem with. In fact, at a BW of 195 my max DL is about 360 but my max back squat is only about 210.
Is it possible to have some vertebrae too flexible, masking hamstring tightness?
How would I fix this problem?