Yoga Poses to Stretch the Hamstrings

I feel like everything I do from running and biking to gardening and simply sitting, shortens my hamstrings. But I find yoga is good medicine for loosening up the backs of my legs. I have rounded up some yoga poses to lengthen tight hamstrings, which can also ease knee, hip, and low back pain and hopefully prevent injuries too. The first four poses are definitely suitable for beginners, with the final three poses being a bit more challenging.