Test de souplesse (flexion assise)

Ce que ça mesure

The sit-and-reach test is the most widely used field assessment of lower-body flexibility — specifically the extensibility of the hamstrings and lower-back musculature. You sit on the floor with legs straight, place your feet flat against the box, and reach forward as far as you can. Your score is compared with age- and sex-matched population norms from the American College of Sports Medicine (ACSM) to give a flexibility category from Needs Improvement to Excellent.

Comment ça marche

The classic sit-and-reach box (Wells & Dillon, 1952) is 32 cm tall with a ruler on top. The foot-line — where your feet rest — is marked at the 26 cm point. Fingertips exactly level with the toes therefore register as 26 cm; reaching further gives a higher number. You perform a brief warm-up, sit with both legs straight against the box, and slowly slide your fingertips along the ruler to your maximum reach, holding for one to two seconds. The best of two or three attempts is recorded. Scores are then matched to ACSM (2018) normative tables stratified by age decade (20–29 through 60–69) and sex.

Conseils pour un résultat fiable

• 1Stretch hamstrings daily — A standing or seated hamstring stretch held for 30–60 seconds, performed daily over six weeks, produces clinically meaningful improvements in sit-and-reach scores. Consistency matters far more than intensity.
• 2Add hip-flexor work — Tight hip flexors — common in people who sit for long periods — limit forward lean independently of hamstring length. A kneeling hip-flexor stretch after each session broadens the benefit.
• 3Try yoga or Pilates — Both disciplines systematically lengthen the posterior chain. Even two 45-minute sessions per week produce measurable gains in flexibility within 8–12 weeks.
• 4Warm up before any flexibility test — Compare scores only when both were taken under similar warm-up conditions. The ACSM recommends a standard 5–10 minute warm-up for reproducible measurements.
• 5Improve lower-back health alongside flexibility — Poor sit-and-reach scores are associated with lower-back discomfort in some studies. Strengthening the core and glutes alongside hamstring stretching produces more durable gains than stretching alone.