"Engels is not an aerobic monster like El G, Ingebrigtsen, McSweyn, etc. He ran 1:44 without any specific 800m training on his "terrible" endurance in a regular race. Jakob couldn't break 1:46 despite having perfect pacing in a time-trial style organized race and with the endurance support of a 13 flat 5k/3:28 1500 runner. Different types of muscle fiber physiology, different types of events."
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El G could possible have broken 1:45 in the 800m if he had cared to focus a bit on the distance.
Jakob couldn´t break 1:46 in an early season race at 19.
Jakob can possibly run at least as fast as Engels and Centro in the 800m when he is 25 if he bothers to make a serious try.