Exercising the lower back throws up many other questions, answers, and debates. In brief, if you have no existing back problems, lifting correctly (inside & outside the gym), and strengthening your lower back muscles, should help you avoid possible injury.
For most weight trainers, the majority of your lower back work will be as a stabilizer or assist/ helper during other exercises (squats and deadlifts being prime examples). Therefore, you should only perform specific lower back exercises toward the end of a workout (refer to article 'Gym Workout Rules-of-Thumb'). Also, as your lower back is a major stabilizer during most exercises, if you have no existing back problems, do not wear a back support! A back support will only serve to take load off your lower back, not help to strengthen it. If you're lifting a weight heavier than you've ever lifted, this is an instance where sometimes wearing a back support is a sensible measure to avoid possible injury. Commonsense should prevail.
Relating to lower back and "core" strength, you may find the article 'How to get Six-Pack Abs' useful too.
Exercises for the Lower Back
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