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RE: Sub 1:50 800m Training
I've looked up 400 metres PR for all sub-1:44 800 metres men. All have PRs between 44.25 & 47.25. According to my research, I've only found two sub-1:44 men whom are sub-45 second men: Alberto Juantorena & Mark Everett. David Rudisha is a 45.0+ man, as far as I know. As does the 1:46 man, I know fast guys too. To be a sub-1:44 man, to run sub-47.25 400 metres, one needs neuromuscular coordination to run sub-22.5 200 metres speed.

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