This actually leads to a less stable spine, meaning a greater chance of injury - the exact opposite effect from what we want. (breakingmuscle.com)
Wearing a weightlifting belt during heavy lifts will support your abdomen area by increasing the intra-abdominal pressure, which is incredibly important for maintaining a stable spine and rigid torso and preventing nasty back injuries. (fitnessandpower.com)
This muscle is responsible for maintaining a stable spine and pelvis. (mindbodygreen.com)