Stratford and several other stations have been moved from Zone 3 to the new Zone 2/3. What this means is that the Zone will change depending on direction of travel. Travelling between these stations and central London will actually be cheaper.
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USDA Hardiness Zone 3 is characterized by its cold climate, with average minimum winter temperatures ranging from -40°F to -30°F (-40°C to -34.4°C).
Oyster CardsOyster PAYG is now valid on Southeastern High Speed services between London St. Pancras and Stratford International. Oyster is also valid on Docklands Light Railway services.
Zone 2 training, often referred to as aerobic training, is characterized by a low-to-moderate level of cardiovascular exertion and power output that can be maintained for a substantial amount of time. Think of an 'easy run' or a moderate bike ride.
The theory is that you use Z2 to get in the training without overtaxing yourself and therefore give your body the proper recovery it needs to make your hard days hard. Z3 used to be referred to as “junk miles” because they were not hard enough to stimulate growth/adaptation, but not easy enough to facilitate recovery.
Zone 1 is aerobic and uses a higher type 1 muscle fiber and fat ratio for energy. Z2 is aerobic, uses type 1 muscle fibers, and fat for energy. Z3 is both aerobic & anaerobic, uses both type 1 & type 2 muscle fibers, and fat & glucose for energy. This is the zone where lactic acid starts to build up as well.
Tourists normally use zone 1 where most of the tourist attractions are located, along with a lot of the popular hotel districts. Some of London's trendy neighbourhoods like Camden and Notting Hill are located in Zone 2.
Greenwich and Cutty Sark stations are in both zones 2 and 3. A travelcard for zones 1 and 2 will take you from central London to Greenwich by any rail or bus route. to explain a bit - there are a few places that are in more than one zone.