Do You Have a Blood Lactate Test?

The polarized system has you spending roughly 90 % of your time in zone one. Zone two is considered the training black hole, or a grey zone where it's not easy enough to be easy and hard enough to get physiological adaptations that you're trying to get with higher intensity efforts. The answer to that is a blood lactate test. Your body is always producing lactic acid, even at walking, very easy efforts, or sitting on the couch. But until we start to accumulate a lot of it, our body is efficient enough to clear it. And that's only at the high intensity efforts where it starts to accumulate and we can no longer clear it fast enough. That's why the burn