How Do I Set a New Lifetime PR on a 600 Meter Repetition?

A good way to think about this is so I had a track session for today's workout. So again, are you talking about? Average intensity over the course of the workout or small snippet in time because they're they're related But they're potentially a little bit different there. The right way to do it both have training value one and even if it costs me It costs me but I'm gonna learn"