Motorsport is a contest where the main exertions go largely unseen. Whether it's the long hours designing and building the cars away from the track, or a driver's true effort at the wheel, understandably concealed by protective kit and safety structures. In many forms of racing there is a roof and windscreen to consider, in single-seaters there is now the halo.
Perhaps the pitstops are the closest outsiders get to seeing absolute effort - unencumbered by obstructions. In modern Formula 1, a sub-two-second pitstop is, frankly, art.
Team radio broadcasts of the modern era go some way to revealing the effort of the exertion, as well as the emotion of the moment - necessarily concealed by crash helmets - that adds a wonderful dynamic to other sporting contests.