What should swimmers do whenever they enter the water head-first?

When swimmers enter the water head-first, holding their arms fully extended overhead is crucial for safety and technique. This position helps protect the head, neck, and shoulders during the entry, reducing the risk of injury upon entering the water. By extending their arms, swimmers create a streamlined shape, which allows them to cut through the water more effectively. This technique also aids in maintaining a proper body alignment, helping to enhance their speed and reduce drag as they enter the water.

Additionally, this method serves to keep the head protected, acting as a buffer against potential impacts if the swimmer is entering a deeper area of the pool or open water. Proper entry techniques are essential for preventing accidents, especially in settings where swimmers may not be fully aware of the water depth, thereby ensuring that their entry is both safe and efficient.