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You want to do some work over your threshold in the warmup. In running this is often called "priming", and for instance middle distance runners will do some 200m efforts at 800m pace etc. This ensures that your lactate is already slightly elevated at the start of your proper efforts, it really makes a difference in having an easier time. This is more crucial for shorter vo2max efforts like 2-10min but I also like them for longer efforts.