There are tons across America probably 100s of thousands and there are local swim teams everywhere. Even more commonly people join local swim teams everywhere.
There are four competitive strokes: Butterfly, Backstroke, Breaststroke, and freestyle. There are also many other styles of swimming such as sidestroke that are not competitive.
This answer depends on the competitive level of the athelete at hand. Anywhere between 10-30 hrs for competitive swimmers
Swimming as a competitive sport : 4'688'227 Swimming as a recreational purpose at public and private pools : 28'798'461 Swimming as a recreational purpose in the sea, rivers and lakes : 36'433'986 Swimming as a profession, eg. diving, pearl fishing, spear fishing : 9'4998'122 Swimming to escape flooding, tsunami, falling into a pool of water : 80'118'791
There are 12 but then you can go on to competitive and higher levels such as being in a squad or a team.
Many people. About 6,000.
87 F is within the range recommended for varied use, this would be general 'family' like use swimming, splashing, floating about. For competitive swimming and exercise recommended temp is about 82 F. Generally 87 F will not do anything to your body, but if you are very active you will not cool off as well causing more sweating. If there are many people using the pool, additional sanitization may be required after use.
Competitive swimming pools widely vary in width. The width (in feet) changes depending on how many lanes it has. Most competitive pools have either six, eight, or ten lanes. An official Olympic sized swimming pool is 50 meters by 25 meters. It is ten lanes wide.
Í think that 6-7 people can compete in swimming.
There are many different sizes. The most common is 25 yards. There are also larger pools.
Swimming can be competitive or recreational (also: synchronized swimming) Competitive swimming is divided into four different strokes: freestyle, backstroke, breastroke, and butterfly. These can be combined in different lengths to create many swimming events.
Many people find swimming an enjoyable way to exercise.
I guess so. Many people swim. Almost everybody have heard about swimming.