In powerlifting, injuries are bound to happen, but that doesn't mean you have to stop lifting heavy. Finding different methods to do the same exercises is important.
This method allows you to still bench press regardless of any pain in your lower back (lumbar spine). This is done by placing an arch-style ab mat on the bench press to support the natural curve in your spine, allowing you to bench press safely and pain free.
Remember, keep your glutes, lats, and shoulder blades touching the bench at all times.