Is it better to run in Zone 2 or 3?
Is it better to run in Zone 2 or 3? Zone 2 is considered the target range for aerobic and base fitness work and should be about 60-70% of your HRmax. Zone 3 is the range for aerobic endurance work and should put you at about 70-80% of your HRmax.
Is Zone 2 or 3 better for fat loss?
Beyond this point, your body will begin to utilize more and more carbohydrates and then begin to decline in metabolic efficiency. Zone 2, therefore, is where you should spend a lot of your time training if you want to improve your fat-burning capability.