The Ravens had 8 Pro bowlers in 2003!!
as of 2013, there have been 91 pro bowlers
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There is a Professional Bowlers Association which conducts tournaments and events for pro bowlers. There are also bowling leagues that allow amateur bowlers compete on lane conditions similar to what the professionals use during pro tournaments. At this time, there is no league specifically and selectively for Pro Bowlers.
Both teams have had many players play in the NFL Pro Bowl.
They practice probably anywhere from 4 to 6 hours a day.
University of Miami
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Pac 10
Many professional bowlers have sponsorship arrangements.
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the ACC