How Collagen Helps Reduce Wrinkles and Repair Skin Why Exercise Matters for Your Skin When people think about exercise, they often think about muscles and strength. But resistance training has another role that can also help your skin stay healthy. One reason is because resistance training helps your body make collagen, which supports smooth and firm skin. What Is Collagen & Wh y Is It Important? Collagen is the main protein in your skin. It helps keep your skin firm, smooth,