Help understanding aerobic/anarobic chart

No, the HRM Dual does not have running dynamics data, and does not need any calibration.

ovekvam said:

No, the HRM Dual does not have running dynamics data, and does not need any calibration.

Ho snap, but does this mean I cannot do the Lactate Threshold and VO2Max tests with this model ?

I think that will work. It just needs precise heart rate data for heart rate variability data.

Grumpy from dawn till dusk said:

Everything above zone 3 and below lactate threshold is the „dead zone“, which should be avoided.

Using the least technical terms possible, could you explain why ? I've watched some videos on YouTube that allude to this too, but I'm not clear about the reason why.

It is about balance between benefit and need for rest. The harder you are working out, the more rest you need to recover before next training. If you have a very hard workout on Monday, you can not do a hard workout on Tuesday. This matters if you are training a lot, so those athletes have mostly light exercise with some very hard workouts now and then. 

If you are the type who workout 2 times a week, you can safely do workouts with any intensity. There is no dead zone that will reduce the benefit of your next workout.

Got it, very clear, thank you ! 

Could someone briefly explain why the optical HR monitor isn't good to do a lactate threshold test ? I have ordered the HRM Dual so I may do this properly but I am trying to understand.

The lactic threshold test is using momentary heart rate variation, so it needs a very accurate heart rate sensor. I guess the wrist sensor is not accurate enough.

Got it thanks, I suspected you would say that, very clear.