This study is a 2-arm, parallel design, single-blind randomized controlled pilot study designed to compare the effects of a tailored multi-level physical activity intervention (PAI) vs healthy living intervention (HLI) on exercise capacity, cardiovascular and cognitive function, health-related quality of life (QOL), strength and fatigue among lymphoma and breast cancer patients undergoing active treatment with anthracycline based chemotherapy (anthra-bC).