“I’m too tired to exercise.” I hear this often from people during cancer treatment and in the months that follow. The next question is usually, “Shouldn’t I just rest?”
It is a reasonable question. Cancer-related fatigue is not the same as feeling tired after a busy day. It can remain after a full night’s sleep and make even ordinary tasks feel unusually demanding. Rest matters, but rest alone does not always break the cycle.
This article is for general education. Before starting or changing exercise during cancer treatment or recovery, speak with your oncologist, surgeon, or physical therapist.
Why doing less can sometimes make fatigue worse
When activity drops for a long period, muscles lose capacity. The same walk, flight of stairs, or household task then requires more effort than it did before. That increased effort can deepen fatigue, which makes movement feel even less appealing. It is an understandable cycle: fatigue leads to inactivity, and inactivity can make the body easier to fatigue.
This does not mean pushing through exhaustion. It means finding an amount of movement that the body can recover from. On some days, that may be a short walk. On others, it may be a few minutes of breathing and supported movement in bed or in a chair.
Why Pilates can be a useful starting point
Pilates does not have to be a demanding workout. In rehabilitation, it can be scaled down to breathing, small joint movements, gentle muscle activation, and carefully supported changes of position. The goal is not to prove how much you can do. The goal is to help the body participate again without overwhelming it.
While co-translating Pilates for Breast Cancer Survivors into Korean, I was reminded of an important principle: on a difficult day, the quality of movement matters more than the size of the session. Ten attentive minutes may be more useful than forcing the body through an hour it cannot comfortably sustain.
A simple way to begin on a low-energy day
Start in a position that feels secure. You might lie on your back with your knees bent, or sit in a chair with your feet supported.
- Take three to five unhurried breaths and notice where the ribs and abdomen move.
- Gently press the feet into the floor, then release.
- Let the shoulders move softly back and forward without forcing range.
- If it feels comfortable, lengthen the spine and slowly turn the head from side to side.
These movements may look modest. That is the point. They give you information: Does your breathing stay easy? Does the movement leave you the same, slightly better, or noticeably more depleted? That response helps guide what comes next.
Pacing matters more than ambition
A good day can tempt people to make up for lost time. They do a long session, feel exhausted afterward, and avoid movement for several days. A steadier approach is usually more useful: begin below your maximum, pause before symptoms escalate, and repeat an amount that feels recoverable.
Fatigue also has many possible contributors, including treatment effects, sleep disruption, pain, anemia, medication, nutrition, and emotional stress. Exercise is not a substitute for medical assessment. New, sudden, or worsening fatigue should be discussed with your care team.
The question to ask after movement
Instead of asking, “Did I exercise enough?” try asking, “How did my body respond?” If a short session helps you feel more settled or makes the next daily task slightly easier, that is useful progress. If it leaves you depleted for the rest of the day, the dose was probably too high.
Recovery is not built by winning against the body. It is built by listening closely enough to work with it. Move only as much as today’s body allows—and let that be enough.
This article is part of the educational series Pilates for Breast Cancer Recovery, informed by Pilates for Breast Cancer Survivors: A Guide to Recovery, Healing, and Wellness by Naomi Aaronson and Ann Marie Turo, which Jaehoon Yang co-translated into Korean.
Leave a Reply