Weak back extensors can reduce spinal and pelvic support but doing an exercise known as the superman could help
The superman stretch begins by lying face down on the ground, with both arms outstretched in the front of the body.
Raise both the hands and the feet off the ground, leaving a gap of around six inches to the floor.
Try to pull in the bellybutton, lifting it off the floor to engage the core muscles.
Keep the head straight and look at the floor to avoid any neck injuries.
Stretch the hands and feet outward as far as possible and hold the positions for two seconds and then return to starting position.