How to Prescribe a Four Times Eight Interval for Athletes

Is there anything to replace experience to help athletes understand the feeling that you have when you're on the edge should go? "There's nothing magical about any of these and i'm not trying to sell one someone say well i'll Steven sells the four times eight that's his" He says some days power needs to be lower, some days it needs to be higher. If you just go out and blindly do every interval  you're not hitting what you're trying to hit yep and driller is great for improving latte clearance.