If you had difficulty performing the stretch, try the following activities to help loosen the soft tissues of the back, and lower extremity.
Sitting hamstring stretch: Start sitting on the floor with the one leg flat out in front with the knee straight and the other bent at the knee. Keep the low back straight and slowly bend forward at the hip toward the straight leg. Hold for 3 breaths. Repeat for the opposite side. Repeat for 10.
Modified hamstring stretch: Start sitting on the floor with the one leg flat out in front with the knee straight and the other bent at the knee. Rotate the straight leg outward. Keep the low back straight and slowly bend forward at the hip toward the straight leg. Hold for 3 breaths. Repeat for the opposite side. Repeat for 10.
Heel sit: Start on all fours on the floor, with the ankles and feet flat on the floor. Slowly bring the body back until you are sitting on the heels, stretching the front part of the leg and the thigh. If you cannot sit on the heels just go as far as possible. Hold the stretch for 3 breaths and return to neutral. Repeat for 10.