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1. Underwater activities are   varied, the most popular of which are snorkelling and   diving. Snorkelling involves swimming face down just below the water surface while breathing through a slender plastic   called a snorkel. Scuba divers, on the other hand, carry a big tank of air that allows them to   while deep underwater.
Aquatic sports have long been acknowledged as excellent ways to take   exercise. Furthermore, practising them is known to produce both psychological and physical benefits which help to improve   states and reduce the risk of many serious diseases.