The Study
Effects of Chronic Static Stretching on Maximal Strength and Muscle Hypertrophy: A Systematic Review and Meta-Analysis with Meta-Regression
This study combines results from many different experiments to see if stretching makes muscles stronger and bigger. It shows that stretching might help a little bit, especially if you do it for a long time and often, but the results aren't perfectly clear.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
This review looked at dozens of studies to see if holding stretches for a long time over weeks can actually make muscles bigger and stronger without weights.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 568 / 100
Quality score
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes, it works, but it takes much more time and effort than lifting weights to get similar results, making it a viable backup option rather than a primary training method.
- 2Stretching for at least 15 minutes a session, 5+ times a week, for over 6 weeks led to small but real gains in strength (d=0.30) and muscle size (d=0.20).
- 3Shorter or less frequent stretching didn't work.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Sports Medicine - Open
Year
2024
Authors
K. Warneke, L. Lohmann, D. Behm, K. Wirth, M. Keiner, S. Schiemann, Jan Wilke
Related Content
Claims (5)
To actually build muscle and get stronger from static stretching, you need to do it a lot—specifically, for at least 15 minutes per session, 5 times a week, for over 6 weeks. Doing it less than that won't give you noticeable results because your muscles aren't being stimulated enough.
Both static stretching and traditional weightlifting can build muscle and strength, but lifting weights gets you better results in less time. Because of this, weightlifting is generally recommended for most people, while stretching is better suited for those who can't handle heavy weights.
Holding stretches for a few weeks in a row can actually make your muscles a little stronger and bigger, even if you don't do traditional weightlifting. This happens because keeping the muscle under tension for a long time signals it to adapt and grow.
Regular static stretching might make you stronger not just by building bigger muscles, but by teaching your nervous system to fire muscle fibers more efficiently. This means your brain and nerves get better at activating muscles, which can boost strength even without visible muscle growth.
Doing a lot of long static stretches can actually build up and strengthen your calf muscles just as much as traditional weightlifting. It means stretching isn't just for flexibility—it can also help you get stronger and bigger muscles.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.