1 Introduction In the highly competitive world of elite swimming, underwater phases became predominant in the recent decades (Veiga and Roig, 2016, Veiga et al., 2016). It all started in the late 80s when backstroke swimmers would spend more than half of their races underwater. Later on, swimmers like Michael Phelps proved that doing well and consistently underwater was a huge advantage. In modern swimming, performing well underwater became an indispensable skill to pretend to higher positions. It provides such an advantage that the regulations limit the distance swum underwater (FINA, 2017).
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