AG Magazine • Fitness & Performance
For decades, gym folklore has insisted that some bodies just are not built for static stretching — that if you are over 40, male, an athlete, or simply “not a flexible person,” your range of motion is basically locked in. A new 2026 systematic review and meta-analysis pooling 79 randomized controlled trials and 3,287 participants puts that assumption to the test, and the results are refreshingly inclusive for anyone building a flexibility training habit.
The researchers, publishing in Sports Medicine Open, tracked how static stretching affects flexibility across children, young adults, middle-aged adults, and adults over 65, as well as men and women, athletes and sedentary beginners, and people who started out tight versus those who did not. The takeaway: static stretching produced a real, moderate improvement in flexibility, and almost none of the traits you would expect to matter actually did.
If you have been putting off a stretching routine because you assumed your age, your sex, or your genetics disqualified you from meaningful gains, this research says otherwise. Static stretching, done consistently, appears to work for nearly everyone who tries it.
What Does the Research Say About Who Gets More Flexible From Stretching?
Across 79 randomized controlled trials and 3,287 people, chronic static stretching produced a moderate improvement in flexibility, with a pooled effect size of Hedges’ g equal to 0.851. Age, sex, training status, baseline flexibility, and the target muscle group made no statistically significant difference in how much people improved.
That effect size sits solidly in the moderate range, and the confidence interval was tight enough for the researchers to rule out those individual traits as meaningful moderators of the result. In plain terms, your muscles do not check your age or your athletic resume before deciding whether to lengthen. The improvement in range of motion held up whether the target was the hamstrings, the calves, or the muscles around the knee.
Worth noting: the study did find substantial variability between the individual trials it pooled, which is common in exercise science given differences in how each research team measured flexibility. That variability does not undo the headline finding, but it is a reminder that this is a strong average effect across a population, not a guarantee for any single person on any single stretch.
Does Age Affect How Flexible You Can Become?
Not meaningfully. The meta-analysis split participants into four age brackets — children and adolescents, young adults, middle-aged adults, and adults 65 and older — and found comparable flexibility gains across every group. A 65-year-old and a 20-year-old following the same static stretching routine can expect similar relative improvement, not a diminished one, which pushes back hard against the assumption that mobility work stops paying off once you pass a certain birthday.
The Myth of the “Naturally Stiff” Person
There is a persistent belief in fitness circles that some people are simply born tight, and that no amount of consistent stretching will meaningfully change their starting point. The same meta-analysis directly tested this by comparing participants with documented baseline muscle tightness against those without it, and found no statistically significant difference in how much either group improved over the course of their stretching routine.
So if being “naturally stiff” does not blunt your results, what does that mean for you? It means the label you have attached to your own body — inflexible, tight, a non-stretcher — may be doing more to stop you from starting a flexibility training habit than your actual physiology ever could.
Do You Need to Already Be Flexible to Improve With Stretching?
If anything, the opposite may be true. A separate meta-analysis and dose-response review, covering 189 studies and more than 6,600 adults, found that people who started with below-average flexibility actually saw larger improvements from static stretching than those who started closer to average.
Combined, the two datasets tell a consistent story: static stretching rewards consistency far more than it rewards your starting point. Showing up matters more than where you began, and that is true whether your goal is touching your toes or simply moving through daily life with less friction.
How Much Stretching You Actually Need
You do not need an hour of floor work every day to see results. That same dose-response review, analyzing acute and chronic stretching volume across its full dataset, found that flexibility gains plateaued at roughly 4 minutes per muscle group per session, and around 10 minutes of total weekly stretching time for longer-term gains. Additional volume beyond that did not produce extra benefit, which is good news for anyone trying to fit a stretching routine into an already busy week.
A few practical takeaways from the dosing research:
- Frequency: Stretch each target muscle group at least two to three times per week for the most consistent chronic effects of stretching.
- Weekly volume: Roughly 10 minutes of total weekly stretching time per muscle group appears to be the point of diminishing returns.
- Consistency over intensity: How hard you push into a stretch mattered far less than how often you actually showed up to do it.
- Pick your targets: Hamstrings, calves, and hip flexors are the most heavily studied and most functionally useful lower-body groups to prioritize first.
If you already do a dynamic warm-up before strength training, static stretching fits better as a separate, standalone session rather than something you rush through beforehand — the research measuring these effects was built around dedicated stretching sessions, not a 30-second pre-workout formality.
⚡ PRO TIP
If you only have ten minutes a week to spare, split it into two or three short sessions targeting one genuinely tight area, such as your hamstrings or calves, rather than trying to stretch everything at once. The research on stretching volume suggests that consistent, modest doses beat occasional marathon sessions for building lasting flexibility.
Why This Matters Beyond the Gym
Flexibility is not just a party trick for touching your toes. Freedom of movement through your hips, hamstrings, and ankles feeds directly into how confidently you squat, climb stairs, garden, or get up off the floor without thinking twice about it.
Ask yourself: when was the last time a tight hip flexor made an ordinary task, like tying your shoes or reaching for something on a high shelf, harder than it should have been? A short, consistent static stretching routine addresses exactly that kind of quiet, everyday friction, and the evidence now shows it works whether you are 22 or 72.
That is the real headline buried in this research. It is not really about who gets the most flexible. It is about the fact that almost everyone gets meaningfully more flexible, and the excuses people use to opt out of a flexibility training routine simply do not hold up against the data.
For anyone managing a nagging tight spot alongside a regular strength program, that is worth sitting with for a second. A dedicated mobility routine is not a nice-to-have bolted onto “real” training. Based on this evidence, it is one of the more reliably effective, low-cost interventions available to almost any healthy adult, regardless of where they are starting from.
Stop Waiting to Be Flexible Enough to Stretch
The data is clear: static stretching works, and it works for you specifically, not just for the naturally bendy person next to you at the gym. Age did not matter. Sex did not matter. Whether you walked in stiff or already loose did not matter. What mattered was showing up, week after week, for a consistent stretching routine.
Start with ten minutes a week. Pick one or two muscle groups that limit your daily movement, hold each stretch to the edge of mild discomfort without pain, and repeat the routine two to three times over the next seven days. That is the entire evidence-backed static stretching protocol — no expensive equipment, no ideal genetics required, just repetition.
