In one sentence, describe what the following article is about:

This might seem obvious, but it is such a vital prerequisite that it is well worth mentioning. You will be able to convince the producers that you are perfect for the show only if you can demonstrate a thorough knowledge of what happens on the show and what it takes to do it. While there are not too many restrictions, there are some basic requirements concerning age, citizenship, and physical condition.  Both you and your teammate must be 21 years of age or older by the start of the next season's filming. Both you and your teammate must be U.S. citizens with valid U.S. passports and valid U.S. drivers licenses. You must also be living in the United States. You and your teammate must not be connected to the producers or affiliates of the show. This includes employers, employees, and relatives of employees/employers. You and your teammate must be physically and mentally fit. You must be willing to have a background check performed, and you must be willing to complete a medical history if chosen as a semi-finalist. If chosen as a semi-finalist, you must be willing to take physical and psychological examinations. You or your teammate cannot be a candidate for public office until after the initial airing of any episodes in which they make an appearance. There are some character traits and qualities that are not strictly essential, but you should be able to demonstrate them during your audition if you hope to get put on the show. You should be strong-willed, outgoing, adventurous, physically adept, mentally adept, adaptable to new environments, and have an overall interesting lifestyle, background, and personality. You need to apply to the show with a specific teammate. Choose someone you know well so that your interactions are more vivid and the relationship appears stronger.  You should not be shy or hesitant to talk about relationships openly and in public. This is a show heavily focused on relationships, so a willingness to be open about relationships and other people is important. In general, someone you have a strong bond with and have known for years would be preferable to someone who you are only faintly acquainted with. A sibling, close cousin, parent, child, close friend, spouse, lover, or ex-lover would be a better choice in most cases than a co-worker or a neighbor you happen to greet every so often. Your relationship does not need to be perfect, but in order to make it through the challenges you will face, you should choose someone you can work together with. Online applications are accepted year-round, but if you hope to be on the show during a certain season, you will need to pay attention to when the deadlines are for that season.  Casting calls usually begin 8 to 12 months before the projected airing date for the season, and roughly 4 to 6 months before the race is filmed. Open casting calls for a given season usually last 1 or 2 months.

Summary:
Watch the show. Know the basic eligibility requirements. Ask yourself if you have what it takes. Grab a partner. Note any deadlines.