I agree with this post.Does exercise regularly really lessen the back pain quickly?

Exercise will lessen back pain at the moment due to the blood rush to the postural muscles.  However, this pain-relief is usually only temporary.

Applied Kinesiology Chiropractor Today

We feel L4 and L5 back pain since most exercise or activities deal with our back carrying our weight or dealing with a load of work. So, before doing any form of exercise or activity it is necessary to perform a warm up activity. There are different warm up activities you can do. A simple stretching exercise before starting your work out can do the trick. Even a ten minute brisk walk is a good form of warm up exercise.

http://www.whatisbackpain.info/exercise-chronic-back/

The discs in the spine are like a tire only filed with fluid instead of air.  In order to remain inflated the spine has to bend and twist to suck fluid from the bone above and below.  Inactivity therefore allows discs to lose fluid and bulge out like a tire with low pressure.  The best exercise for pain is done while the spine is not under a load. Pilates exercises on a ball are very effective for this.

Hans Albert Quistorff, LMP

Antalgic Posture Pain Specialist 

Back pain is very common among adults and is often caused by overuse and muscle strain or injury. Treatment can help you stay as active as possible. And it will help you understand that some continued or repeated back pain is not surprising or dangerous.

Most  back pain can get better if you stay active, avoid positions and activities that may increase or cause back pain, use ice, and take nonprescription pain relievers when you need them.

When you no longer have acute pain, you may be ready for gentle strengthening exercises for your stomach, back, and legs, and perhaps for some stretching exercises. Exercise may not only help decrease low back pain, but it may also help you recover faster, prevent re-injury to your back, and reduce the risk of disability from back pain.

Exercises to reduce low back pain are not complicated and can be done at home without any special equipment.

It's important that you don't let fear of pain keep you from trying gentle activity. You should try to be active soon after noticing pain, and gradually increase your activity level. Too little activity can lead to loss of flexibility, strength, and endurance, and then to more pain.

But if you have continued and chronic pain symptoms i suggest you consult an expert doctor. http://www.com-pat.com/