The hamstrings, part of the posterior chain, are one of the most important and influencial muscle we use on a daily basis, weak hamstrings can predispose someone to back isses, range of movement problems, knee problems, and decrease your ability to lift correctly while fatigued. This is why we should all do assistant exercises for the hamstrings. If you struggle with keeping your midline tight and flat, have back pain, knee pain, or just want to get more fit, this is some great stuff for you. Here are some exercises that you should work into your training.