Well okay, you think (based on trying to look at notoriously innacurate "instantaneous pace data" I pressume?) that Rob ran a downhill for 1/3 of mile heading into Tennessee Valley at sub 5-min pace? Yeah I admit that could be true....for a quarter of a mile downhill. I'm not sure how you think you calculated those exact speeds for less than 1/2 of a mile in distance though? His fastest actual mile split of the race was a 5:26....on that downhill at mile 48. It is all right here: https://www.strava.com/activities/188173878/overview Yeah maybe for 100m or 200m here and there he hit sub 5-min pace but there are no mile splits that were sub 5 min miles from him....and there were no sub 5-min miles from me when I ran 6:07 on the 51.7 mile course in 2014. Well it does look like you split a 4:54 at mile 5 (your fastest). But then again you only ran just about half the race and then dropped out? FYI part of the reason you probably cramped was because you didn't pace yourself very well. Nobody in the lead pack who wants to finish top 10 will drop a sub 5:00 mile so early in the race (Not even Max King)...even on that first big downhill at mile 5 in dry conditions.