Probably the most effective natural remedies for back pain there is. Resting in a hot bath can help increase the elasticity of your muscles, thus, this can help relax and even eliminate the back pain completely after 20 minutes or so, providing your condition is not really serious.
Using both of your hands you should touch your left knee and bring it as close to your chest as you can. Hold this position for 10 seconds and then slowly, with your hands lower your leg back to the original position. Alternate to the right leg and repeat this for three sets.