Running Destroys your Muscles as you Age. After the Age of 30, you should be Fighting Sarcopenia and Boosting your Muscle Mass to Build and Maintain your Strength and Longevity. Stop Running and Start Doing Real Exercises that will Help you Achieve this like Lifting Weights, Doing Bodyweight Strength Training, Walking, Eating Plenty of Protein, and Getting Enough Rest. Being Healthy as you Age is Simple!