The document discusses the importance of assessing running mechanics in developing athletes. Proper running mechanics result in greater efficiency and force production while preventing injuries. Coaches should observe runners from multiple angles using video to analyze range of motion, symmetry, sequencing and other factors. Common issues that impact mechanics include poor posture, tightness, weakness and inflexibility. Fixing mechanics requires cueing, strengthening, improving range of motion, and training with quality over excessive volume under fatigue.