For breast cancer survivors, regular exercise could pay dividends well beyond physical fitness. Two new studies published in the Journal of the National Cancer Institute found that a 12-month remotely delivered exercise intervention led to meaningful improvements in attention and memory — and even slowed biological aging at the molecular level — compared to a health and wellness control program.

In the cognitive study (n=253), participants in the exercise arm showed greater increases in moderate-to-vigorous physical activity at every follow-up, along with better performance on secondary measures of attention and memory. A parallel study in a subsample of 124 participants found that epigenetic aging clocks (GrimAge2 and DNAmFitAge) ticked more slowly in exercisers over the same 12-month period — and faster epigenetic aging correlated with greater cognitive decline.

Key Takeaways:

• Exercise improved attention and memory vs. a health and wellness control in breast cancer survivors
• Epigenetic aging was measurably slower in the exercise group per two validated biological clocks
• Greater cognitive decline was linked to faster epigenetic aging, suggesting a molecular mechanism behind exercise's brain benefits
• The intervention was remotely delivered, making it scalable and accessible

Why it matters: Cognitive impairment is a common and distressing side effect for breast cancer survivors, often called "chemo brain." These findings suggest that structured exercise may offer a practical, non-pharmacological strategy to protect both brain function and slow biological aging — a meaningful quality-of-life win for the millions living after a breast cancer diagnosis.