Personal best time, not anthropometry or training volume, is associated with total race time in a triple iron triathlon In certain sports resp.Disciplines seem to benefit the athletes of certain characteristics of the body building. Also, training should be important in the area of extreme duration. To successfully finish a triple Ironman, but the experience seems to be of the utmost importance, read below https://pubmed.ncbi.nlm.nih.gov/20651605/