Aerobic fitness differs from strength fitness primarily in training focus and benefits. Aerobic fitness emphasizes endurance and cardiovascular health, utilizing prolonged activities like running, cycling, or swimming to improve heart and lung function. In contrast, strength fitness focuses on building muscle strength and mass, primarily through resistance training exercises like weightlifting. While aerobic training enhances stamina and promotes fat loss, strength training improves muscle tone and metabolism, including both types in a fitness regimen provides comprehensive health benefits and promotes overall functional fitness.