I've watched people surf in the ocean, but I've heard some waves in lakes and rivers can be suitable for it!
I love surfing in the ocean.  Is there some sort of surfing competition at the Olympics?
actually, there is a U.S> open of suring held every year in Huntington Beach, CA
How does one join the U.S. open for surfing?  Can anyone join or do they have to be seasoned professionals in the event?
Professional certification
Professional certification, trade certification, or professional designation, often called simply "certification" or "qualification", is a designation earned by a person to assure qualification to perform a job or task. Not all certifications that use post-nominal letters are an acknowledgement of educational achievement, or an agency appointed to safeguard the public interest.
Overview.
A certification is a third-party attestation of an individual's level of knowledge or proficiency in a certain industry or profession. They are granted by authorities
US Open of Surfing
The U.S. Open of Surfing is a week-long surfing competition held annually during the summer in Huntington Beach, California. Generally held on the south side of the Huntington Beach Pier, the U.S. Open is part of the qualification process for the World Surf League and is a WSL QS 10,000 event. It is the largest surfing competition in the world. It has been owned by IMG since 2000.
As part of the event, notable people in the world of surfing are added to the Surfing