Additionally, the lymphatic system doesn't have a pump like the circulatory system. So not only does exercise improve blood circulation thereby improving oxygen and nutrient delivery body wide, exercise improves lymph flow thereby assisting in removing metabolic waste products from the interstitial fluid. Also, the lymphatic system can be considered an immune organ, so exercise improves the immune response.

And, of course, we know nutrients like Zinc and Vitamin C are essential for tissue repair via being essential for DNA replication.