When divers perform tucks and pikes, where they grab their feet, it is important to keep in mind that wet hands and feet can be slippery. Therefore, it is crucial to towel them off before diving.
During the Olympics, divers often warm up in hot tubs between dives. This means they have to repeatedly towel themselves off and get wet again during the competition.
Small sports towels, also known as shammies, are excellent for absorbing water and can easily be wrung out after use. Some divers even have a ritual of dropping their towel into the water from the diving board to measure the distance.
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Source: www.sciencefocus.com