When people think about cancer treatment, the focus usually lands on surgery, chemotherapy, or radiation. Fitness isn’t usually part of that first list. Movement is increasingly being integrated across different stages of care, from preparing the body before treatment to supporting recovery afterwards
The gap is timing. Most people only encounter this idea when they’re already overwhelmed. By then, fatigue has set in, routines have shifted, and even basic tasks can feel harder.
The reality is straightforward: movement during cancer care centres on maintaining independence and rebuilding it over time. Across clinical studies, appropriate exercise has been shown to help reduce treatment-related fatigue and improve quality of life, including during active treatment.
Before treatment: What you do now shapes what comes next
The period between diagnosis and treatment is often filled with appointments and decisions, so fitness isn’t typically prioritised. This window can influence how well the body tolerates what comes next.
A common misconception is that exercise needs to be structured or intense to be effective. Even short, consistent movement has value, especially when the goal is to prepare the body for what lies ahead.
Even small reductions in activity can show up in everyday ways, like needing to pause halfway up a staircase that used to feel effortless. Keeping some level of movement helps maintain day-to-day function and prevent a sharper drop in capacity.
Starting simple can be enough:
- Maintain basic activities such as standing, walking, and getting out of a chair
- Keep routine tasks manageable rather than exhausting
- Establish a routine that can be built on over time
This doesn’t require structured workouts. It can begin with walking, light resistance exercises, and gentle mobility work.
Before treatment begins, structured exercise can play a key role in preparing the body for chemotherapy, radiation, or surgery. Christopher, clinical exercise physiologist, explains that this approach, often referred to as prehabilitation, focuses on strengthening the body ahead of the physiological stress of cancer therapy
Improving muscular strength and cardiorespiratory fitness increases overall physiological reserve, which may support better treatment tolerance, reduce dose delays, and lower the risk of complications. Stronger muscles and improved aerobic capacity also help maintain mobility, balance, and independence during recovery
From a metabolic perspective, exercise improves insulin sensitivity, reduces systemic inflammation, supports immune surveillance, and enhances vascular function, all of which play an important role during cancer treatment. In surgical settings, prehabilitation has been associated with fewer postoperative complications, shorter hospital stays, and a faster return to baseline function.
The psychological impact is equally important. Engaging in exercise before treatment can help reduce anxiety, improve mood, and provide a sense of control at a time when many patients feel overwhelmed.
Ultimately, prehabilitation isn’t about performance. It’s about building physical, metabolic, and emotional resilience to better withstand treatment and support recovery.
In practice, this translates into a prehabilitation routine focused on building physiological reserve through a balanced, individualised programme, combining aerobic activity, resistance training, functional movements, and basic mobility or breathing work. What is appropriate depends on the individual’s diagnosis, treatment plan, symptoms, and baseline fitness level.
For someone who’s more deconditioned, this may begin with:
- 10 to 15 minutes of walking four days a week
- Simple functional movements such as sit-to-stands, wall push-ups, light resistance band rows
- Daily breathing exercises
For those with a higher baseline, it may involve:
- 30 minutes of brisk walking or cycling four to five days a week
- Two to three resistance sessions that include squats, rows, presses, and step-ups
There’s no one-size-fits-all template. Programmes often start conservatively for more vulnerable individuals and progress towards moderate-intensity structured training for most patients, with further scaling for those who can tolerate it. Adjustments may be needed day to day based on fatigue, pain, or other treatment-related effects.
In some cases, condition-specific modifications are essential, such as avoiding high-impact loading in patients with bone involvement or prioritising breathing work before thoracic procedures. Where possible, working towards these principles can support treatment tolerance, reduce complications, and improve recovery, while keeping the focus on meeting patients where they’re and progressing safely.
During treatment: Rethinking rest
A common misconception is that rest is always better during treatment. In reality, prolonged inactivity often contributes to worsening fatigue, reduces strength, and makes everyday tasks more difficult over time.
It’s also common to assume that fatigue means stopping movement altogether. Complete rest often makes fatigue harder to manage.
Cancer treatment affects how the body responds to activity. Energy levels, muscle strength, and balance can fluctuate depending on side effects such as fatigue, nausea, or neuropathy.
This may show up as:
- Feeling drained after activities that previously felt manageable
- Reduced strength for simple, everyday tasks
- Unsteadiness when walking or changing positions
Movement during this phase shifts towards maintenance:
- Short, low-intensity walks instead of long sessions
- Light strength work to keep muscles engaged
- Stretching to reduce stiffness and improve comfort
A practical way to approach this is through short bouts of movement across the day, typically five to ten minutes at a time, adjusted based on how the body feels.
Some days, movement may simply mean walking around the home or doing a few gentle stretches. That still counts. It can begin with something as simple as a five-minute walk, repeated once or twice a day, and built up gradually.
During active treatment, physiological changes such as fatigue, anaemia, neuropathy, nausea, and cardiovascular fluctuations can directly affect exercise tolerance. Rather than stopping movement altogether, exercise is strategically adapted. Frequency, intensity, duration, and type of activity are adjusted based on daily symptoms, relevant clinical markers where appropriate, and overall recovery status.
On lower-energy days, this may include:
- Gentle walking
- Breathing exercises
- Mobility work
- Light resistance training
These approaches can help maintain circulation, joint range of motion, and neuromuscular activation without overexertion.
On stronger days, activity may shift towards:
- Moderate aerobic exercise
- Strength-based training
These support muscle mass, cardiovascular capacity, and metabolic health.
Importantly, consistent movement during treatment has been shown to reduce cancer-related fatigue, mitigate muscle loss, improve mood, support sleep quality, and maintain functional independence. It may also help regulate inflammation and support treatment tolerance over time.
The guiding principle is flexibility and responsiveness, meeting the patient where they’re physiologically, while maintaining safe, structured consistency to prevent deconditioning.
This same flexibility also applies to when to scale back or pause. In most cases, exercise can continue with adjustments, but pain remains a key signal. Sharp, worsening, or unfamiliar pain is a clear indication to stop and modify or avoid that movement. In contrast, general muscle soreness or mild joint stiffness can often be managed by reducing intensity, adjusting range of motion, slowing tempo, or shortening duration.
Patients may need to scale back when experiencing persistent fatigue, poor recovery, mild dizziness, or symptoms that worsen during activity. Exercise should be paused, and medical advice sought, if more serious warning signs arise, including:
- Chest pain
- Significant shortness of breath
- Unresolved dizziness
- New or worsening bone pain
- Swelling
- Fever or signs of infection
- Neurological symptoms such as loss of balance
The goal remains consistent: stay as active as possible, while adapting to what the body can safely tolerate, without pushing through symptoms that may lead to harm.
For caregivers: Supporting without overpushing
During treatment, energy levels can fluctuate unpredictably. What feels manageable one day may feel difficult the next. It can be difficult to know when to encourage more and when to hold back.
Support focuses on maintaining consistency, not pushing progress.
- Encourage movement without focusing on intensity or duration
- Look for patterns over several days rather than reacting to a single difficult day
- Help maintain simple, repeatable routines that feel manageable
It can be tempting to do more on days when energy improves. This often leads to setbacks, where fatigue returns more strongly the following day.
A steadier approach is often more sustainable. The aim is to maintain a baseline level of activity that the body can tolerate, rather than cycling between doing too little and too much. Not every day needs to look the same, and small amounts of movement still count.
Cancer-related fatigue, muscle loss (sarcopenia), and declining stamina are among the most common and functionally limiting side effects of treatment. Christopher notes that while rest may seem like the solution, prolonged inactivity can accelerate deconditioning, worsen weakness, and further reduce energy levels. Appropriately prescribed exercise helps interrupt this cycle.
Low-to-moderate intensity aerobic training supports mitochondrial health, circulation, and endurance without overwhelming recovery capacity. Resistance training plays a critical role in preserving lean muscle mass, maintaining strength, and protecting bone density, all of which are essential for independence and treatment tolerance.
The key is precise dosing. Sessions are structured with conservative starting points, gradual progression, adequate rest intervals, and close symptom monitoring. The goal isn’t exhaustion or performance gains. It’s the preservation of function, mitigation of decline, and maintenance of daily living capacity.
When properly supervised, exercise becomes a restorative stimulus rather than an added stressor, helping patients maintain strength and stamina safely throughout treatment.
After treatment: Why “back to normal” is not the reality
When treatment ends, there’s often an expectation that things should return to normal. Physically, that isn’t always the case.
There is often an assumption that recovery means returning quickly to previous levels of activity. Rebuilding capacity takes time and follows a different trajectory.
Common experiences after treatment include:
- Persistent fatigue
- Reduced strength and endurance
- Joint stiffness or discomfort
- Changes in balance or coordination
- Reduced confidence in movement
Recovery begins with reassessment. The body has changed, and it needs to be approached accordingly.
Progress typically involves:
- Restoring basic movement patterns such as sitting, standing, and walking efficiently
- Rebuilding strength to support daily activities
- Improving cardiovascular fitness to regain endurance
- Addressing balance and coordination
One of the biggest barriers at this stage is uncertainty. Some hold back, while others try to do too much too quickly. Structured, and when needed supervised, exercise helps create a clearer and safer progression.
After treatment ends, many survivors face significant deconditioning, persistent fatigue, neuropathy, joint stiffness, hormonal changes, or reduced bone density. Just as impactful is the psychological barrier, including fear of injury, recurrence, or pushing too hard. A safe return-to-exercise pathway begins with reassessment, not intensity.
The first step is evaluating current strength, cardiovascular fitness, balance, mobility, and any treatment-related limitations. From there, programming focuses on rebuilding foundational movement patterns, restoring muscular strength, and gradually improving aerobic capacity. Progression is intentional and incremental, often starting below pre-diagnosis levels and building week by week.
Education and reassurance are equally important. Survivors benefit from understanding normal post-treatment sensations versus warning signs, which helps rebuild trust in their bodies. Over time, structured progression restores not just physical capacity, but confidence, autonomy, and resilience.
The goal isn’t to bounce back overnight. It’s to rebuild stronger and smarter for long-term health.
This rebuilding often begins with consistency before intensity, using simple, low-barrier routines that can be adjusted based on daily energy levels and symptoms. A starting point may look like:
- 10 to 20 minutes of walking, three to five days per week
- Light resistance exercises two days per week, such as sit-to-stands, wall or incline push-ups, and resistance band rows (one to two sets of eight to twelve repetitions)
- Brief daily mobility work
Another approach is to incorporate short “movement snacks” throughout the day, such as:
- Five to ten minutes of light activity, including walking, stairs, or basic strength movements
- Repeated two to three times daily
The key is scaling and modifying based on tolerance. This may involve reducing duration, intensity, or range of motion on lower-energy days, while gradually building capacity as tolerance improves. Pain remains the guide. Sharp or worsening pain signals the need to stop, while mild discomfort or general deconditioning can often be worked through within reasonable limits.
Where possible, working with a trained professional, such as a clinical exercise physiologist or an American College of Sports Medicine–certified Cancer Exercise Trainer, can help determine an appropriate starting point and guide progression safely based on individual needs.
Over time, patients can progress towards longer aerobic sessions and more structured strength training. Early success, however, comes from keeping the routine simple, flexible, and sustainable, while gradually restoring confidence in movement.
When to get advice: Signs that need attention
Consider speaking to a healthcare professional if:
- Fatigue is persistent and limiting daily activities
- Pain increases with movement or doesn’t improve with rest
- There are balance issues or a history of falls
- Treatment side effects are affecting function
- You are unsure what level of activity is appropriate
Stop exercising and seek advice if there’s:
- Dizziness or faintness
- Chest discomfort
- Unusual shortness of breath
- Sudden weakness or instability
Being specific helps
- “I feel exhausted after simple tasks. Is this expected?”
- “My strength feels lower than before. How should I rebuild it?”
- “What type of movement is appropriate at this stage?”
Across the cancer care continuum, supervised exercise provides structure, safety, and clinical oversight that supports both short- and long-term outcomes. Christopher highlights that individualised programming ensures intensity, volume, and progression are aligned with medical status, treatment phase, and symptom burden, helping to reduce risk while maximising benefit.
Long term, supervised exercise supports sustained improvements in strength, cardiovascular fitness, metabolic health, bone density, and functional independence. It can help reduce persistent fatigue, improve sleep, enhance mood, and support overall quality of life. Emerging evidence also suggests that higher levels of fitness are associated with better treatment tolerance and improved survival outcomes in several cancer populations.
Equally important is the psychological impact. Working with a trained professional provides reassurance, accountability, and a safe environment to move again. Survivors begin to shift from feeling fragile to feeling capable. Over time, supervised exercise becomes more than rehabilitation. It becomes a pathway to rebuilding confidence, reclaiming autonomy, and restoring trust in the body.
Cancer treatment changes how the body feels and functions. Strength drops. Energy fluctuates. Tasks that once felt routine can take more effort or feel less predictable.
At this stage, fitness maintains the ability to move through daily life and rebuilds capacity over time. It often starts with small, manageable actions such as short walks, simple movements, and routines that can be repeated without adding strain.
What matters is what can be sustained. Doing too much on better days, then stopping completely, makes recovery harder. A steadier approach helps preserve function and supports gradual progress. These efforts influence how someone gets through treatment, how recovery progresses, and how confidently they return to everyday life.
Christopher Fitzmaurice, MS, CEP, CSCS, CET
Clinical Exercise Physiologist
University of Miami Health System – Executive Health, USA
Instagram @exercisebeatdiseases
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