Movement: From a kneeling position on a mat or pad, extend the leg to be stretched behind the body. Use the other leg to step forward creating a resting lunge position. Reach upward with the same arm as the stretched leg and hold for the desired time. To increase the stretch, create a slight rotation in the upper back away from the stretched leg, or add an elevation to the foot of the back leg.
Repetitions: Hold for the full prescribed time on one side, then switch sides and repeat. This counts as one set.
Instructions and effects for the Lunge Stretch exercise 
Movement in Sagittal Plane