Similarities and differences in anthropometry and training between recreational male 100-km ultra-marathoners and marathoners. For 100 km runners, the marathon best time is a highly significant variable for the 100 km time.We now asked ourselves the question of whether marathon runners regarding physique and training are similar to 100 km runners.It turned out that marathon runners had little differences in skin fold thicknesses. For both groups of runners, a deep body fat was important for a quick runtime. The marathon runners invested significantly less time training and ran faster in training as the 100 km runners. The details of the study are under https://pubmed.ncbi.nlm.nih.gov/22724447/