How to strengthen my lower back?

Well you definately need to strengthen your core. So your core consist of your lower back and abdominals. So any ab workouts would do and for the lower back you should do a workout call good mornings. And do not for get your obliques. That is the sides of your abs. Good luck and it takes a lot of discipline to go to the gym especially after a long day at work. Eat healthy and and get rest