It is exactly what I meant!! You ran a 200m in a race - my athletes do a 150m as part of their warm up … with the SAME outcome!!
According to them, they don’t get the ‘flat feeling’ after 150m in the race. We do this if it is a ‘once off’ 400m race - not when there are different rounds, e.g. heat and semi-final on the same day, final the next day.