What is Zone 4 called?

Welcome to the Threshold zone! Even if you don't choose to train in the Z4 Threshold zone, it's a place you're no doubt familiar with, though maybe you are unfamiliar with its name. Here's a hint: this is also known as the “shortness of breath” zone. Sound familiar?



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Fare zone 4 is an outer zone of Transport for London's zonal fare system used for calculating the price of tickets for travel on the London Underground, London Overground, Docklands Light Railway and, since 2007, on National Rail services.

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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.

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