Tight hamstrings can not only effect your workouts but they can also cause lower back pain. Learning how to stretch them properly is key. If you incorporate some stretches into your weekly workout routine, you’ll become more flexible, have better running form and also decrease injuries to your lower back. But, be sure to stretch your hamstrings AFTER your workout or after you warmup first. You never want to stretch cold muscles – especially hamstrings. You also don’t want to OVERSTRETCH your hamstrings or you could end up pulling a muscle and make things worse. So, go easy on the stretches and make sure you warm. Another good option for hamstring stretching is the foam roller.