Hi, today we will take a look at one sport injury that often afflicts treadmill runners – hamstring injuries. The hamstring is a group of 3 muscles located at the back of the thigh. Injuries to the hamstring may occur due to a whole range of reasons. Typical symptoms of hamstring injuries include pain, swelling, spasm, or restricted movement etc of the hamstring. I have outlined some things you should take a look into, if you are experiencing hamstring injuries.