Sit-and-Reach (Flexibility) Calculator

Sit-and-reach flexibility test

The sit-and-reach test measures the flexibility of the lower back and hamstrings, which is associated with day-to-day mobility and lower-back health. The protocol uses a Wells bench: sit with legs extended and feet flat against the box, then slowly reach forward and hold for two seconds; the reading in cm is taken relative to the foot line (negative if you cannot reach it, positive if you go past it). Adult reference values (ACSM, mixed cm): around 0 to 5 cm is low, 5 to 15 cm average, over ~20 cm excellent, with women typically scoring 3–5 cm higher than men and scores declining with age. Warm up first and never bounce — sustained reach reflects real flexibility.

Applications

Used in physical-education evaluation at schools and gyms, in FITNESSGRAM and Eurofit health-related fitness batteries, in physiotherapy to track recovery from low-back pain or hamstring injury, in sports screening for football, dance, gymnastics and martial arts, and in occupational health programmes that monitor workers exposed to prolonged sitting or repetitive lifting.

FAQ

Does sit-and-reach predict low-back pain? It correlates with hamstring and lumbar flexibility, but the link to back pain is modest — use it together with core-strength tests and posture assessment.

Why do women usually score better than men? Differences in pelvic anatomy, relative leg/torso length and connective-tissue extensibility give women a small structural advantage; norms are therefore reported separately by sex.

How can I improve my result? Regular static stretching of the hamstrings, hip-flexor and lumbar fascia (3–5 sessions/week, 30 s holds) plus dynamic mobility work typically increases sit-and-reach by several centimetres over 6–8 weeks.

Is the protocol the same everywhere? Two common variants exist: classic sit-and-reach (foot line at 26 cm on the box) and modified back-saver (one leg at a time, used in FITNESSGRAM). Compare results only within the same protocol.