Flexibility Guidelines (ACSM)
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ACSM's current (2011) guidance is to stretch each major muscle–tendon group at least 2–3 days/week (daily is best), holding 10–30 s for 2–4 reps — about 60 s per stretch; the 1998 version said at least 4 reps of 10–30 s.
Detail
Earlier edition — ACSM 1998 position stand (exercise to develop and maintain muscular strength and endurance, flexibility, and body composition):
Flexibility training: Stretches for the major muscle groups should be performed a minimum of 2–3 days per week; at least 4 repetitions, held for 10–30 seconds, should be completed.
A related general flexibility prescription (Musculoskeletal Conditioning, p. 216) gives:
- Frequency – daily
- Intensity – to a position of mild discomfort
- Duration – 10–30 seconds for each stretch
- Repetitions – 2–6 for each stretch
- Type – static, with a major emphasis on the low-back and hamstrings area because of the high prevalence of low-back pain syndrome in society.
Current ACSM position stand (Garber et al., 2011):
- Frequency — ≥2–3 days/week, with the greatest gains from daily stretching.
- Intensity — stretch to the point of tightness or slight discomfort.
- Time — hold a static stretch 10–30 s for most adults; 30–60 s may benefit older adults.
- Volume/pattern — 2–4 repetitions, aiming for about 60 s of total stretching per exercise.
- Type — static (active or passive), dynamic, ballistic and PNF are all effective; for PNF, a 3–6 s contraction at 20–75% of maximum followed by a 10–30 s assisted stretch.
- Flexibility work is most effective when the muscle is warmed first (light-to-moderate aerobic activity or external heat).
The p. 216 page also notes the warm-up should include light activity to raise heart rate and internal body temperature, followed by flexibility exercises stretching the musculature around the major skeletal joints; attempting to stretch a cold muscle can be dangerous to the surrounding soft tissue.
Key facts
- Current ACSM (2011): ≥2–3 days/week (daily best); hold 10–30 s (30–60 s for older adults); 2–4 reps, ~60 s total per stretch; PNF 3–6 s contraction then 10–30 s assisted stretch.
- Earlier edition (ACSM 1998): ≥2–3 days/week, at least 4 repetitions, held 10–30 seconds.
- General prescription (p. 216): frequency daily; intensity to mild discomfort; 10–30 s duration; 2–6 reps; static type; emphasis on low-back and hamstrings.
Connections
- Flexibility Guidelines (Program Standards) — the program-standard counterpart (10 s hold, repeat twice, static).
- Static Stretching — the recommended stretch type.
- Benefits and Outcomes of Flexibility Exercise — why flexibility matters.
Sources
- Position standPollock ML et al. ACSM Position Stand: The recommended quantity and quality of exercise for developing and maintaining cardiorespiratory and muscular fitness, and flexibility in healthy adults. Med Sci Sports Exerc 1998;30(6):975–991 (superseded by Garber et al. 2011) Published 1998 · DOI 10.1097/00005768-199806000-00032 · Accessed 2026-10-13
- Position standGarber CE et al. American College of Sports Medicine position stand. Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: guidance for prescribing exercise. Med Sci Sports Exerc 2011;43(7):1334–1359 Published 2011 · DOI 10.1249/MSS.0b013e318213fefb · Accessed 2026-10-13
Corrections (1)
- 2026-10-13 — Labelled the 2–3 d/wk, at least 4 repetitions, 10–30 s prescription as the ACSM 1998 position stand (wording checked against the stand's full text). Added the current ACSM 2011 position stand (Garber et al.): at least 2–3 d/wk with daily most effective; stretch to tightness or slight discomfort; hold 10–30 s (30–60 s may benefit older adults); 2–4 repetitions for about 60 s total per stretch; static, dynamic, ballistic and PNF all effective; PNF = 3–6 s contraction at 20–75% of maximum then a 10–30 s assisted stretch; most effective when the muscle is warm.
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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.