In the early 1900s it was thought that exercise directly stimulated growth; however, by the end of the century it was suggested that young athletes were selected based on inherited physical attributes that enhanced performance success. In this paper, the physical attributes and normal patterns of growth of young athletes, both competitive and recreational, are discussed. Specifically, the paper addresses the question, Are young athletes born with physical attributes suited to a sport or does sport training produce these physical attributes? Variability in the tempo and timing of normal growth and development is addressed, and its relevance and influence on youth talent identification is discussed. This is pertinent in today’s context of sport specialization at relatively young ages. Regular physical training is only one of many factors that could affect child growth; however, distinguishing influences of training programs on growth from those associated with normal growth and development is problematic.