Sit and reach Protocol 

Not Affiliated with CSEP - PATH
This videos shows you how to carry out the CSEP sit-and-reach protocol. It is the most common way to measure hamstring and lower back flexibility, and poor performance gives a good indication of poor back health.
The CSEP standardized flexometer distance is 26cm forward from the footplate
These CSEP guidelines are under constant revision - If you notice any mistakes or out-of-date information, please let me know in the comments so I can update the video accordingly.
Radoslaw Wiechecki - UVic - 4th year Kinesiology; CPT
Connor McManaman
REFERENCES
Fitness and amateur sport. (1987). Canadian Standardized Test of fitness (3rd ed.). Ottawa ON: Fitness and amateur sport.
Mayorga-Vega, D., Merino-Marban, R., & Viciana, J. (2014). Criterion-Related Validity of Sit-and-Reach Tests for Estimating Hamstring and Lumbar Extensibility: a Meta-Analysis. Journal of Sports Science & Medicine, 13(1), 1-14.