Question: Which professional sports does the athlete, born in 1977, who has defended the championship title as many times as the American professional mixed martial artist Stipe Miocic, play? 
Context: Brock Edward Lesnar ( ; born July 12, 1977) is an American professional wrestler and former professional mixed martial artist, professional American football player and amateur wrestler who is currently signed with WWE.  He performs on the Raw brand where he is the current WWE Universal Champion in his first reign. Saul Almeida (born June 4, 1989) is a Brazilian-American professional mixed martial artist currently competing in the featherweight division for the World Series of Fighting.  A professional mixed martial artist since 2008, Almeida has also formerly competed for Bellator. Kevin "The Soul Assassin" Ross (born July 27, 1980) is an American Muay Thai kickboxer and former mixed martial artist (with one pro fight).  He is currently Ranked #14 in the world by the WBC for Muay Thai in the Super-Lightweight Division (140 lbs, 63.503 kg).  Among Kevin’s achievements so far are the Super light weight (140 pounds) WBC International championship Title, the Welterweight (147 pounds) WBC USA National championship Title, the FIDAM Welterweight championship of Mexico and the United States Muay Thai Federation Welterweight champion.  He currently trains at Combat Sports Academy in Dublin, California. Jens Johnnie Pulver (born December 6, 1974) is an American professional mixed martial artist and undefeated boxer and kickboxer.  Pulver was the inaugural UFC Lightweight Champion in addition to serving as the head coach on "The Ultimate Fighter 5" reality show against long-time rival B.J. Penn.  In mixed martial arts, Pulver competed at the Lightweight, Featherweight, Bantamweight and Flyweight divisions in addition to competing at the Middleweight, Light Middleweight, and Welterweight divisions as a professional boxer.  While perhaps best known for competing in the UFC, Pulver has also competed in Pride Fighting Championships, for the PRIDE 2005 Lightweight Grand Prix.  He is to-date the youngest UFC Lightweight Champion in the UFC history, eventually relinquishing his title, after two defenses, due to a contract dispute.  Pulver officially retired from combat sports in 2014.  Pulver is considered the founder of the UFC lightweight division. Jay Dee "B.J." Penn (born December 13, 1978) is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner.  Penn debuted and competed in the Ultimate Fighting Championship (UFC), and later in K-1.  Prior to fighting for the UFC, he became the first American Gold medalist of the World Jiu-Jitsu Championship.  In mixed martial arts, Penn has competed in the Featherweight, Lightweight, Welterweight, and Middleweight divisions.  As a former UFC Lightweight Champion and UFC Welterweight Champion, he is one of only three fighters in UFC history to win titles in multiple weight classes.  Penn was also a Co-champion in the UFC 41 Lightweight Tournament, due to an eventual draw opposite Caol Uno in the tournament finale.  Through his tenures as champion, Penn unofficially unified the UFC Lightweight Championship (against Sean Sherk) and broke the all-time lightweight title defense record.  Penn was inducted into the UFC Hall of Fame, as the inaugural inductee in the Modern-Era Wing by career-long rival Matt Hughes, during "International Fight Week" in July 2015. Stipe Miocic ( ; born August 19, 1982) is an American professional mixed martial artist currently competing in the Ultimate Fighting Championship (UFC).  He is the reigning, defending UFC Heavyweight Champion.  As of September 2017, he is ranked #3 pound-for-pound in the UFC.  Miocic has defended the belt twice, and by doing so has tied the record for most successful title defenses held with Randy Couture, Tim Sylvia, Brock Lesnar, and Cain Velasquez. Patrick "Pat" Healy (born July 20, 1983) is an American professional mixed martial artist currently competing in the Lightweight division of Titan FC.  A professional competitor since 2001, Healy has also formerly competed for the UFC, Strikeforce, the WEC, the IFL, the MFC, King of the Cage, ACB and Shark Fights.  His twin brother, Ryan, is also a professional mixed martial artist. Lee Hasdell (born 13 December 1966) is a British martial artist, promoter and former professional kickboxer and mixed martial artist.  Hasdell is considered by many as a true pioneer of UK mixed martial arts, as he was the main driving force and innovator in the 1990s.  Hasdell promoted the first professional Mixed martial arts events in the United Kingdom and has helped develop many of the standards within the British MMA scene of today. Miesha Theresa Tate ( ; born August 18, 1986) is an American Mixed Martial Arts Pundit and former mixed martial artist who competed in the Ultimate Fighting Championship (UFC) and is a former UFC Women's Bantamweight Champion.  Primarily known for her grappling ability, Tate became a wrestler while attending Franklin Pierce High School in Tacoma, Washington and won a state championship during her senior year in 2005.  She began her professional mixed martial arts (MMA) career in 2007, and won the bantamweight championship of the Freestyle Cage Fighting promotion in 2009.  Tate gained increased recognition in 2011, when she won the Strikeforce Women's Bantamweight Championship.  She has also won a silver medal in the FILA Grappling Championships. The Art of War Fighting Championship (英雄榜/Art of War/AOW) is a Chinese professional mixed martial arts promotion based in Beijing, China.  The Chinese title "英雄榜" literally translated means "Gathering of Heroes."  Art of War FC has no relation to the defunct US MMA promotion Art of War Undisputed Arena Fighting Championship.  Art of War I was held at the Beijing Sports University on November 6, 2005.  The inaugural event made it the first professional mixed martial arts contest in the People's Republic of China.  To date, AOW has held 15 events in mainland China.  Its largest event was Art of War 12 - Invincible, held at the National Olympic Sports Center Auditorium in Beijing on May 23, 2009 to an audience of around 6,000 fans.  The event attracted many international guests, including former UFC Heavyweight Champion Tim Sylvia, renowned ring announcer Michael Buffer, and experienced referee "Big" John McCarthy.
Answer: American football