Best exercises to prevent lower back injury while weight training?

Work with a trainer: There are no specific exercises that will prevent a lower back injury. If you are doing an aggressive program, it is best to work with a trainer or have your program directed by a physical therapist, professionals who are trained to monitor muscle usage and strain. In general, temper your weight program with stretching and flexibility activities and monitor muscle tightness and spasm.

Strengthen core: Abdominal strengthening exercises--planks, crinches, pilates, all protect the lower back when weight training.