The purpose of this literature review is: 1) to provide an overview of which classical cross-country skiing sub-technique (double poling (DP), diagonal stride (DS)) yields the most beneficial energetic cost (EC), i.e., low energy cost and high gross efficiency at different speed-slope combinations; and 2) if the athletes` choice of sub-technique (DP, DS) agrees with the goal of using the sub-technique that yields the most beneficial EC accordingly. Methods: The literature search was conducted using the databases SPORTDiscus and Google scholar. The primary articles included trials on DP and DS in relation to EC, as well as trials investigating athletes` free choice of sub-technique, both at different speed-slope combinations. Results: The main findings were that: 1) DS has a more beneficial EC at a low speed-high slope combination, and DP at high speed-low slope combination; 2) the athletes` free choice of sub-technique corresponds with the goal of obtaining a beneficial EC. Conclusion: When considering EC, there seems to be a "cheapest" sub-technique (DP, DS) for different terrains in classical cross-country skiing. Also athletes` free choice of sub-technique seems to be in accordance with obtaining the "cheapest" sub-technique. It also seems that choice and change of sub-technique occurs due to other determinants related to EC. Energetische Kosten des Doppelstocklaufs und des diagonalen Schritts im klassischen Skilanglauf bei verschiedenen Geschwindigkeits- und Steigungskombinationen: Eine Literaturübersicht
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