Book excerpt: This is the latest volume in the IOC Encyclopaedia of Sports Medicine series, summarizing the evidence from all relevant sources on the genetic and molecular basis of sports and other human physical performance. The initial chapters address the basic science of genomics and genetics and the regulation of gene expression. Additional chapters provide authoritative information on the genetics of complex performance phenotypes, the contributions of small animal research, family and twin studies, and ethnic comparisons. A final section addresses the issue of the contribution of specific genes and molecular markers as related to endurance, strength and power, and responsiveness to specific conditioning programs. This latest volume in the Encyclopaedia of Sports Medicine Series from the Medical Commission of the International Olympic Committee is a must for sports and exercise scientists who require a thorough guide to the most cutting edge science in this expanding field.