04/09/2026
Zone 2 gets talked about a lot, but the basic idea is pretty simple.
Itās low-intensity aerobic training, generally performed just below your first lactate or ventilatory threshold. Youāre working, but the effort is controlled enough that you can sustain it for a long time.
For endurance athletes, that matters because it allows you to accumulate a large amount of aerobic training volume without creating the same fatigue as repeated hard sessions.
Thatās also where the 80/20 approach comes from.
Research looking at elite endurance athletes has repeatedly found that roughly 75ā80% of training is completed at relatively low intensity, with a much smaller proportion reserved for genuinely hard work.
š³š“ Itās also a big part of the Norwegian approach.
Norwegian endurance programmes have become famous for threshold training and carefully controlled lactate sessions, but what sometimes gets missed is the huge volume of easy aerobic work sitting underneath those harder sessions.
The hard work is only possible because so much of the overall training load is controlled.
And thereās some good evidence behind the approach.
Recent reviews suggest training models that combine large amounts of low-intensity work with smaller amounts of higher-intensity training can improve VOā Max, exercise economy and endurance performance, particularly in trained athletes.
So Zone 2 isnāt necessarily magic.
Its real advantage is that you can do a lot of it, recover from it and build the aerobic foundation that lets you get more out of your harder sessions.
Think:
š“ Longer steady rides
š Easy aerobic runs
š£ Controlled rowing
š Steady swimming
Lots of controlled work. A little bit of very hard work. Repeat consistently.
One important note: āZone 2ā can mean slightly different things depending on whether youāre using a 3-zone, 5-zone or heart-rate-based system, so individual testing can help establish where your actual aerobic zones sit.
