A swimming pool is a basin filled with water intended for recreational or competitive swimming, diving, wading or other water exercise. Many pools are indoor so that people can swim year round, but some are outdoor. Many modern pools have chemical disinfectants such as chlorine to kill germs and keep the water clean. Some have mechanical devices that circulate the water and make it smoother and less choppy. Others use biological filters and plants to filter and clean the water. Natural pools, which are growing in popularity, seek to recreate swimming holes and naturally-occurring bodies of water.
Swimming pools have been used for sport since ancient times, and they continue to be an important part of the Olympic Games. Many different sports can be practiced in a swimming pool, from water polo to synchronized swimming. In addition, they are commonly used for therapeutic purposes such as water aerobics, as well as for recreational activities such as canoeing and kayaking.
Many hotels and resorts have swimming pools for their guests to enjoy during their stay. These pools are often referred to as spa pools. They are also found at many SPA centers and gyms.
In addition to a regular pool, some are designed with specific features such as waterfalls, infinity edges and pool bars. There are also whirlpool baths, which are similar to a hot tub but are smaller and used for more intense hydrotherapy. These are sometimes used for health and fitness, as they can help with back pain and rheumatism.
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