 In March 2007, approximately 9 months before the IAAF study was conducted, Pistorius's coach commented that Pistorius had not trained enough to achieve an upper body commensurate with the upper bodies of most elite sprinters.To obtain the most accurate understanding of how the prostheses affect Pistorius's performance, he should be compared to athletes with similar physical potential.Consequently, the IAAF study may have been flawed because it compared Pistorius, who might have the physical potential to run faster than his current times, against athletes at their peak.