“Isn’t core work basically abdominal exercise?” I hear this question in the studio all the time. After breast surgery, the distinction matters.
The core is not one muscle and it is not a six-pack. It is a coordinated system that includes the diaphragm, deep abdominal muscles, pelvic floor, and muscles around the spine. It helps us breathe, transfer weight, raise an arm, stand from a chair, and respond to changes in balance.
This article offers general education, not a rehabilitation prescription. The timing and type of exercise after surgery should be discussed with your surgeon, oncologist, or physical therapist.
Surgery can change more than the surgical area
After a mastectomy, the body often adopts a protective posture. The chest may feel guarded, the shoulders may round forward, and breathing may become shallower. These are understandable responses to pain, tightness, uncertainty, and healing tissue. They also change how the trunk shares load.
A person may feel that her abdomen has become weak, but the problem is not always a lack of strength. Sometimes the body has temporarily lost coordination: breathing, the rib cage, the shoulder girdle, and the deep abdominal wall are no longer working together as they did before surgery.
Why “tighten your stomach” may be the wrong first cue
When people decide to rebuild their core, they often begin by gripping the abdomen or attempting demanding exercises such as planks. More effort feels like more progress. Early in recovery, however, effort without coordination can create unnecessary pressure and reinforce breath-holding or guarding.
While co-translating Pilates for Breast Cancer Survivors into Korean, one idea stood out to me: awareness often needs to come before strengthening. Before asking the body to produce more force, we first need to notice how it is already responding.
Begin with breath and contact
Lie on your back with your knees bent and your feet supported, if that position has been cleared and feels comfortable. Place one hand lightly below the navel. Let the other rest where it is comfortable—on the side ribs, for example, rather than over a sensitive surgical area.
Inhale without trying to make the breath large. Notice whether the abdomen and ribs can respond. Exhale and allow them to settle. Do not pull the stomach hard toward the spine. The first task is simply to feel movement without forcing it.
This may appear too easy to count as exercise. Yet after surgery, restoring a calm relationship between breathing and the trunk can be meaningful work.
Support is different from gripping
Once your medical team has cleared progression, a gentle abdominal response can be added to the exhale. Think of narrowing the lower abdomen slightly, as if slowly closing a zipper—not pulling it as tight as possible.
Keep the breath moving. If the neck stiffens, the chest becomes more guarded, or the back presses forcefully into the floor, reduce the effort. A useful core response should support movement, not freeze the body.
From there, a clinician or appropriately trained instructor may introduce small arm or leg movements. The range is less important than the ability to keep breathing and remain comfortable.
The shoulder and core cannot be separated
In real movement, the trunk and shoulder girdle work as a team. The torso provides a base for the arm, while the ribs and shoulder blade need enough freedom to move. This is why post-mastectomy Pilates should not treat abdominal work and shoulder mobility as unrelated tasks.
A well-designed session connects them gradually: breathing with supported arm movement, gentle trunk control with weight shifting, and eventually more functional patterns such as reaching, carrying, and standing.
Start from the body you have today
Recovery does not follow one timetable. Surgery type, reconstruction, lymph-node procedures, treatment, pain, fatigue, and previous activity all influence the starting point. Comparing your body with someone else’s—or even with your own body before surgery—rarely gives useful guidance.
The better question is: What can I feel and control comfortably today? Core recovery is not about bracing harder. It is about rebuilding trust, coordination, and support one layer at a time.
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.
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