Top 3 Most Physically Demanding Sports

This is a tough question to answer as there are so many factors. Therefore, we need to establish what we class as physically demanding.

We need to consider the different components of fitness, such as muscular strength, muscular endurance, cardio-respiratory endurance, and speed. Of course, when it comes to the term "physically demanding", we tend to think of components that apply huge metabolic stress, such as muscular and cardiorespiratory endurance, rather than coordination, balance, and reaction time - is maximal endurance more demanding than maximal strength?