Environmental loads, stresses, and strains (associated with gravity, or even the furniture you rest on) can be balanced and contained by optimal posturing.
Pinched spinal nerves can develop suddenly or gradually. Sudden compression usually occurs in the setting of an acute joint problem called a “herniated disc,” also discussed in more detail elsewhere.
Poor strength might be a contributing factor to the development of a spine-related disorder if the demands placed on the spine exceed a patient’s strength capacities.