Start as early as your healthcare team says it is safe to do so. There is no universal number of weeks because procedures, medical conditions and starting abilities differ. More time allows gradual progression, but a short window can still be used thoughtfully.
When you have several weeks
A longer window gives clinicians time to assess you, introduce exercise, review nutrition and adjust the plan based on your response. Progress should be gradual. The goal is consistent preparation, not exhausting yourself before surgery.
When surgery is close
If only days or a few weeks remain, focus on priorities. These may include continuing safe daily movement, practising prescribed breathing exercises, eating enough, reducing smoking or alcohol with professional support, and planning transportation and help at home.
Do not delay necessary treatment
Prehab should fit around the surgical plan. It is not a reason to postpone a medically necessary procedure unless your surgical team makes that decision. Ask which changes are worthwhile within the time available and which should continue during recovery.
A practical first conversation
Bring your surgery date, medication list, health history and questions to the assessment. Mention chest symptoms, dizziness, recent falls, uncontrolled pain or major changes in function so the team can decide whether additional medical review is needed.
The key idea
Prehab should be personal, practical and connected to your healthcare team.
Do not start or intensify exercise, change medication, or use supplements because of an online article. Ask a qualified clinician what is appropriate for your health and treatment plan.
Sources and further reading
For the broader evidence base, visit Preluma's supporting research library.
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Medical disclaimer: This article is general education, not medical advice, diagnosis or treatment. Follow the instructions of your surgeon, oncology team, primary-care clinician and other regulated healthcare professionals. Seek urgent care for severe or sudden symptoms.