Exercise will benefits many, or perhaps all, types of healing. It does so many good things for the body. For one it increases circulation. Healing requires the proper nutrients and the removal of wastes, which are both provided by blood circulation. Google "exercise and healing".

Exercise also affects gene expression, that is what our genes do. Interesting article with numerous examples:

Exercise and gene expression: physiological regulation of the human genome through physical activity
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2290514/

Ron