Running is a primitive movement that many people can benefit from. Unfortunately many people who enjoy running spend too much time recovering from injury and not enough time maximizing their performance. Extrinsic factors that cause people to get injured and stop running might be improper shoes, increased volume too soon and random program design. Intrinsic factors could be dysfunctional movement patterns, muscle imbalances, poor lifestyle habits, weight gain or poor running gait. Running is a great activity to build aerobic capacity, stay lean and healthy and improve your mood.