Beat Chemo Brain and Fatigue—with a Simple Workout
Emerging research suggests that exercise—yes, even light stretching or a gentle walk—may do more for cancer patients than we once believed.
According to a comprehensive new umbrella review published in the British Journal of Sports Medicine, movement may help ease a wide range of chemotherapy-related side effects, from fatigue and pain to the dreaded “chemo brain.”
This review evaluated 80 studies covering 485 different associations between exercise and treatment outcomes.
And the results were encouraging: Over half showed statistically significant benefits, and nearly half had high to moderate evidence backing them.
Whether it was aerobic activity, resistance training, high-intensity interval training (HIIT), or mind-body movement like yoga or tai chi, physical activity consistently supported better outcomes for people undergoing cancer treatment.
Chemotherapy can be lifesaving—but it often comes at a steep cost to quality of life. Pain, inflammation, peripheral neuropathy, anxiety, brain fog, sleep disturbances… the list goes on.
But this new review suggests that exercise can help offset those effects. For example, aerobic and resistance training helped reduce inflammation and boosted overall strength. HIIT and tai chi were found to reduce pain, while yoga led to notable improvements in anxiety and depression.
Even cognitive issues—often described by patients as brain fog—improved with consistent physical activity.
Perhaps most striking of all: people who exercised before surgery had fewer post-operative complications, pointing to a powerful role for movement in preparing the body for the stress of treatment.
And while different exercise types had varying impacts, the evidence pointed to one clear truth: doing something is better than doing nothing.
So how exactly does exercise help? It’s not just about burning calories or building muscle.
Experts say movement affects a range of biomarkers tied to cancer outcomes. For example, exercise reduces levels of C-reactive protein (a marker of systemic inflammation), insulin, and insulin-like growth factors—biological drivers linked to both cancer progression and resistance to treatment.
By balancing these markers, exercise may actually help the body respond better to chemotherapy and other therapies.
What’s more, exercise can support vascular and neurological health, which is especially important when treatments risk damaging heart or brain function. In fact, previous research has shown that exercise can reduce chemotherapy-related cardiotoxicity.
As Dr. Milan Sheth, a board-certified oncologist who was not involved in the review, explained: “The symptoms that seem to be most improved include peripheral neuropathy, brain fog, fatigue, anxiety, and shortness of breath… [with] improvements in sleep quality, body composition, and mood.”
Beyond lab results, the review emphasized something more personal: helping patients feel better during a grueling and often overwhelming process.
As Dr. Bhavana Pathak, an integrative oncologist, put it, “The therapy we give—while it could keep you alive—can take away a life worth living, without the means to articulate, adapt, and engineer your life.”
That’s where exercise may shine—by helping patients reclaim strength, agency, and even joy during treatment.
If you or a loved one is currently undergoing cancer treatment, exercise might sound daunting.
But the good news is that even low-intensity movement can make a difference. A few examples that showed benefits in the review include:
- Tai chi or yoga: Gentle movements that ease stiffness and calm the mind
- Walking or light cycling: Supports cardiovascular health and reduces fatigue
- Resistance bands or bodyweight exercises: Helps maintain strength and lean body mass
Always consult with your doctor or a physical therapist before starting a new routine, especially during treatment. But don’t wait for the perfect moment—small steps count, and the benefits build over time.
In a world where side effects too often steal quality of life from those fighting cancer, it’s heartening to know that something as simple as movement can make a big difference.
To lacing up those sneakers,
Rachel Mace
Managing Editorial Director, e-Alert
with contributions from the research team
