Why this for your hamstring strain? Let’s first get a good grasp of what a muscle strain is. A muscle strain happens when we place a load through the tissue at a force and length that it wasn’t ready for, thus, we end up with tearing of the muscle fibers. For the hamstring muscle specifically, we see muscle strains happening more frequently when the hip is flexed past 90 degrees. For example, when we are running and driving the knee forward to plant it on the ground for our next stride. So how d