Body construction and competition times at Ironman Triathlen On the basis of a larger collective of Ironman triathletes, we examined which characteristics of body construction are important for which section in an Ironman.
A deep body weight, a deep body mass index, and a deep body fat correlated both with the total time as with the marathon time. In addition, the surges of the upper arm were associated with the marathon time as the thigh. The details can be found under https://pubmed.ncbi.nlm.nih.gov/22375214/