CATEGORY: MEN’S HEALTH
For men keeping a close eye on low-risk prostate cancer rather than treating it right away, being physically active — even a few hours of moderate activity such as brisk walking each week — was associated with a substantially lower risk of that cancer progressing to a more aggressive form, according to a 2026 study that followed more than 800 men for a median of about six years.1
What “Active Surveillance” Means
Prostate cancer that appears small and slow-growing is often not treated immediately. Instead, many men choose active surveillance — a monitoring approach in which doctors track the cancer with regular blood tests (measuring PSA, or prostate-specific antigen, a protein that can rise when the prostate is active or abnormal), scans, and periodic biopsies (small tissue samples), stepping in with treatment only if signs suggest the cancer is becoming more dangerous. The central worry during surveillance is grade reclassification: when a repeat biopsy shows the cancer looks more aggressive than it first appeared. Researchers wanted to know whether everyday physical activity is linked to how often that happens.
What the Study Found
Among the 828 men, those who reported doing even modest amounts of physical activity had roughly 70% to 80% lower risk of their cancer progressing to a genuinely aggressive grade compared with men who were essentially sedentary. Notably, the benefit did not require heavy training: men doing the equivalent of a few hours of brisk walking a week showed a reduction about as large as those who exercised much more, suggesting the advantage may level off early rather than climbing steadily with more and more exercise. The link was also specific — activity was tied to lower risk of progression to clearly aggressive disease, while its association with milder upgrades did not reach statistical significance. A higher-quality overall diet showed a similar association with lower risk of aggressive progression.
How the Study Worked
The men were all part of a long-running active surveillance program and had the least aggressive category of prostate cancer (called Grade Group 1) when they enrolled. At the start, each completed a questionnaire about his physical activity, which researchers converted into a standard measure of weekly exercise. The men were then followed for a median of about six years, during which repeat biopsies checked whether the cancer’s grade had changed. By comparing progression rates across activity levels — and accounting for factors such as age and other health measures — the researchers estimated how activity related to the odds of the cancer worsening. Because activity was measured once at the beginning, the study reflects habits around the time of enrollment rather than changes over the years that followed.
Why Activity Might Matter
Researchers cannot yet say exactly why movement would track with slower progression, but plausible explanations include physical activity’s effects on chronic inflammation (a persistent low level of the body’s immune response that may help feed cancer growth), on insulin and related growth signals in the blood, and on body weight — all factors studied in prostate cancer biology. In this study, these remained possibilities to explore rather than proven mechanisms.
Association, Not Proof
This was an observational study, meaning it tracked men’s existing habits rather than assigning them to exercise — so it can show a link but cannot prove that activity itself slowed the cancer. Men who are more active often differ in other ways, such as weight, overall health, or other habits, that could influence the results. The finding is best seen as a prompt for conversation, not a diagnosis or a treatment plan. It adds to a growing body of research suggesting that staying active may matter for men managing early prostate cancer — a question your own care team can weigh against your specific situation.
Key Takeaways
- Among men on active surveillance for low-risk prostate cancer, higher physical activity at enrollment was associated with a roughly 70% to 80% lower risk of the cancer progressing to a more aggressive grade — an association, not proof of cause.
- The link appeared even at modest activity levels (a few hours of moderate activity a week) and did not clearly grow stronger with more exercise.
- The association was clearest for progression to genuinely aggressive disease; the link with milder upgrades was not statistically significant.
- If you have prostate cancer or are considering active surveillance, talk with your doctor about how physical activity and overall lifestyle fit into your monitoring plan before making any changes.
References
- Higgins MI, Su ZT, Mamawala M, Jing Y, Landis PK, Alshak MN, Grutman AJ, Rivera Lopez CA, Pavlovich CP, Trock BJ. Physical activity at baseline and risk of prostate cancer grade reclassification on active surveillance: results from a prospective cohort study. Prostate Cancer and Prostatic Diseases. 2026 Feb 18. doi:10.1038/s41391-026-01085-9. link