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.
If you want to build huge muscles, you must continually challenge them by placing a greater demand upon them. If you stick with the same stress level month after month, you'll quickly reach a point where your body is used to the stress and won't need to adapt (i.e. grow) anymore.
In Part One of my "no curls" arm specialization training series, I talked about the absurdity of most arm specialization routines. I proposed that most trainees do more than enough biceps curls and triceps press downs and don't really need more of either of them.