[header] How to touch your toes [title] Do stretching after a warm-up or exercise. [step] Many people don't consider the muscle groups in their lower back when considering flexibility, but you can stretch these muscles to help avoid strains for any number of exercises. The cat-camel stretch is a great way to stretch lower back muscles. 
Simply get down on all fours and alternate between rounding your back toward the ceiling and pushing your stomach toward the floor while lifting your buttocks. Hold each position for 15-30 seconds at a degree where you feel a nice stretch but no discomfort.