Top 5 hamstring stretch to prevent injury during workouts. You may also want to do this stretch sitting down as passive stretching is more effective than active stretching as in this diagram of an active hamstring stretch.
Roll Your Feet on a Tennis Ball to Loosen Tight Hamstrings
As a runner you need to keep the back of your legs flexible and loose if you are serious about preventing injury and running your best. Here are the 7 hamstring stretches you need: hamstrings-stretches-runners/
This is a "classic" that we use in the office for people that are active, and people needing to improve their overall flexibility. It can help people with low back pain, both acute and chronic, people with acute hamstring strains and