How does a mattress align the spine?

Mattress Talk General Mattresses Questions
2

Hi SleepTampa,

Yes, a mattress can indeed be too firm, and as a result achieve poor alignment. You can see an excellent first introduction from Phoenix here:

https://forum.mattressunderground.com/t/how-to-look-for-and-find-the-best-mattress-for-you-read-first

He reviews PPP, the first 2 P’s being posture and pressure relief. The trick is indeed to find a mattress that is suitable for you, and allows you to achieve the right posture / alignment and pressure relief. The good news is it’s not impossible to find a suitable mattress to achieve this for yourself, the bad news is that it can take some effort to do that.

In any event, I think the above link will help you understand the fundamentals.