This document discusses athlete's heart and the use of echocardiography in evaluating it. It notes that intense dynamic training can cause eccentric hypertrophy while intense isometric training causes concentric hypertrophy. It references several studies on using new echocardiography techniques to differentiate physiological cardiac remodeling in athletes from pathology. One study found 4D strain imaging useful to identify subtle abnormalities. Other studies examined global longitudinal strain for assessing athlete's heart and the role of cardiac biomarkers to improve diagnosis. The document provides an overview of research on evaluating cardiac changes in athletes using echocardiography.