>>> THE LARGEST MASS GATHERING OF THE PANDEMIC ERA NOW ONE WEEK AWAY, AND A NEW SPORT IN MAKING ITS DEBUT IN TOKYO, BMX. >> THREE OF THE ATHLETES ARE FROM RIGHT HERE IN THE AREA. BRIAN MIMS INTRODUCING US TO THREE OF THE RIDERS WHO HAVE PRACTICED THEIR HIGH FLYING STUNTS. >> Reporter: THIS IS BMX FREESTYLE. FLYING, FLIPPING, AND TWIRLING THROUGH THE AIR. LOOKS EXHILARATING AND EXHAUSTING. >> THE OLYMPICS ARE COMING TOWARDS THE END OF MY CAREER. I NEVER THOUGHT I WOULD GET THE OPPORTUNITY TO GO. >> Reporter: THEY OPENED THIS COMPLEX IN 2014. HE QUALIFIED FOR THE GAMES IN 2017, WHEN THE BMX REGULATING AGENCY APPROVED FREESTYLE AS AN OLYMPIC SPORT. >> I THOUGHT WELL, IT'S ONLY THREE MORE YEARS, I HAVE GASOLINE STILL IN THE TANK, SO LET'S GO FOR IT. ALTHOUGH HE'S A U.S. CITIZEN, HE'LL REPRESENT HIS BOYHOOD COUNTRY OF VENEZUELA IN TOKYO. >> KNOW HOW MUCH IT WOULD MEAN. IT'S A COUNTRY THAT HAS HAD A LOT OF POLITICAL TROUBLES. >> Reporter: 21-YEAR-OLD JUSTIN DOWELL WILL BE AMONG FOUR RIDERS RESTING THE U.S. >> I CAN'T LIE AND SAY, LIKE, GOING TO THE OLYMPICS WAS A DREAM OF MINE, BECAUSE IT WAS SO FARFETCHED FOR MY SPORT TO BE IN THERE, JUST BECAUSE BMX HAS ALWAYS BEEN LIKE A REBEL SPORT, YOU KNOW WHAT I MEAN? >> Reporter: AND A MALE DOMINATED SPORT, BUT THAT IS CHANGING. NEAT 24-YEAR-OLD NAKITA WHO DROP UP IN CALIFORNIA AND NOW LIVES IN HOLLY SPRINGS. HER FATHER IS FROM SWITZERLAND, SO SHE DECIDED TO BE THE ONE BMX RIDER REPRESENTING THAT COUNTRY. >> IT WAS A HARD CHOICE, BUT THE U.S. ALREADY HAS A CREW OF AMAZING RIDERS, SO I FIGURED, YOU KNOW, WE WOULD SPREAD IT AROUND AND HELP THE SMALLER COUNTRY OUT. >> Reporter: TWO OTHER FREESTYLERS HAVE BEEN TRAINING HERE. THE RIDERS WILL GET TWO 60- SECOND RUNS TO PERFORM THEIR ACROBATS, AND THEY'RE SCORED ON DIFFICULTY, CREATIVITY, AND EXECUTION. >> THE CONSTANT, LIKE, CIRCLING OF PERFECTING SOMEBODY THAT USED TO SCARE ME, AND THEN IN COME AS NEW TRICK THAT SCAREOSE ME ALL OVER AGAIN. TRY TO KEEP ONE DAY AT A TIME. >> Reporter: THAT'S FREESTYLE DONE, WITH SUCH STYLE. >> SHE JUST MADE THAT LOOK LIKE IT WAS SO EASY. OKAY. [ LAUGHTER ] WE HAVE SOMEONE TO LOOK FORWARD TO. LOOK FORWARD TO THAT.