Hotels may have pools available for their guests to use at their own leisure. Many of these municipal pools are outdoor pools but indoor pools can also be found in buildings such as natatoriums and leisure centers. It is common for municipalities of every size to provide pools for public use. Many health clubs, fitness centers, and private clubs have pools used mostly for exercise or recreation. In-ground pools are most commonly constructed from materials such as concrete, natural stone, metal, plastic, or fiberglass, and can be of a custom size and shape or built to a standardized size, the largest of which is the Olympic-size swimming pool. Pools can be built into the ground (in-ground pools) or built above ground (as a freestanding construction or as part of a building or other larger structure), and may be found as a feature aboard ocean-liners and cruise ships. Olympic-sized swimming pool and starting blocks used for the 2006 Commonwealth Games in Melbourne, AustraliaĪ swimming pool, swimming bath, wading pool, paddling pool, or simply pool, is a structure designed to hold water to enable swimming or other leisure activities.

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