Exercise-induced sweat might actually be a powerful medicine that can heal chronic, "unhealable" wounds.

We usually think of sweat as just stinky water that cools us down, but this study shows it’s a biological powerhouse. In models of diabetic foot ulcers—wounds that are notorious for never healing and leading to amputations—scientists found that exercise-induced sweat actually triggers the skin to rebuild itself. It speeds up the growth of new skin and helps lay down the collagen that holds wounds together. This is a total "wait, really?" moment because it suggests the best treatment for a chronic wound might be as simple as a workout. It turns a waste product into a potential life-saving therapy for millions of people with diabetes.