Background: Despite the evidence that regular physical activity can have beneficial effects on the physical and psychological well-being of cancer patients, a review of the literature reveals that a majority of young cancer patients fail to attain the same levels of physical activity that they had before contracting the disease. There is scientific evidence that physical inactivity induces muscle catabolism and atrophy and cardiovascular diseases, which may lead to a further increase in fatigue and a decrease in the functional capacity of cancer patients. Empirical evidence is needed to explore an appropriate strategy for promoting physical activity in such patients.