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Chronic training load, often abbreviated as CTL, is the cumulative training dose that builds up over a long period of time. This concept is especially popular in cycling, among athletes who use a cycling power meter, which simplifies the collection and review of training data. The main concept is that an appropriate level of CTL will cause the body of an athlete to go through fitness adaptations. The time span over which it is measured ranges from weeks to months. The concept of CTL is often used in comparison to that of acute training load to plan or examine the results of a training program.