Train Smarter. Run Faster. Reclaim Your Time. (range assuming 10/s 16-30miles and 8/s 25-38miles) Are you ready to tackle 13.1 miles without letting training take over your life? Welcome to the Efficient Half Marathon, a plan specifically designed for the busy professional, parent, or athlete who thrives on a balanced schedule. Claytree Coaching, we believe every mile should have a purpose. This 8-week program moves away from high-volume and moves toward Purposeful Progression. By focusing on ...