RIO DE JANEIRO -- BMX racing is growing up at the Summer Olympics.Its that extreme sport where cyclists pedal on bikes over a roughly quarter mile-long course filled with bumps, hills and sharp twists.Lots of action in a race that lasts about 40 seconds. A sport aimed at younger audiences.It is also now filled with a generation of elite riders who have been at it since BMX became an Olympic medal event in Beijing in 2008.Most people in London (at the 2012 Games) were young like me, or 19, 20, so we grew up and stayed at a good level in BMX, said 25-year-old reigning world champion Joris Daudet of France.Now many of those same racers are back at the colorful track in Rio de Janeiro , creating a deep field of experienced riders.On the mens side, the United States features a team that includes 2012 Olympians Connor Fields and Nic Long, and 2012 alternate Corben Sharrah. Australias Sam Willoughby is back after taking silver four years ago.Latvias Maris Strombergs is back to win a third straight gold. At 29, hes a BMX sage.Everybody is focused on this event. Everybody has the experience, too, Daudet said. He had the top time of 34.617 seconds during the mens seeding runs on Wednesday to earn the top seed in the quarterfinals on Thursday.Colombias Mariana Pajon is off to a fast start in defense of her Olympic title, earning the top seed in the womens draw with a time of 34.508 seconds on a warm, muggy afternoon. The women next race on Friday.Australias Caroline Buchanan and the United States Alise Post are other medal favorites who raced in London, and U.S. rider Brooke Crain is also a returnee. Theyre all getting pushed by younger riders who watched them compete four years ago.Its definitely made it a lot more interesting in racing, Post said.BMX, an abbreviation for bicycle motocross, traces its roots to the late 1960s and early 1970s in Southern California. Besides racing, there is also freestyle BMX in which cyclists ride ramps and perform tricks on their bikes.But racing is the discipline that has taken hold at the Olympics. Over the years, its grown from niche activity to X-Games event to an Olympic medal sport.Yeah, people dont ask if we do back flips anymore, Buchanan said. Were not the BMX bandits of the Beijing Games, the first-timers.BMXs inclusion into the Olympics eight years ago prompted other countries to create programs to develop riders. In the cases of smaller nations like Latvia and Colombia, more attention might be paid to a rider once he or she achieves a level of success.The field this year is deeper than ever, Fields said. Another top medal contender is the Netherlands Niek Kimmann, 20, who won time trials at the worlds in May.Now all over the world, Fields said, you have guys who are 18 to 21 years old who are graduates of their respective countrys development program, which is something that in 2008 or 2012, you wouldnt have gotten that same sort of pathway.The United States is consistently a top contender, though cycling in general has not been a top funding priority for the U.S. Olympic Committee, regardless of discipline.That means more international riders have caught up to the U.S cyclists. International World Cup races, in turn, have become more competitive in recent years.That BMX has stuck around for three Olympics is a positive sign for action sports in general. The 2020 Games will add three more action sports to the lineup to attract younger audiences: climbing, skateboarding and surfing.Consider BMX a trailblazer for the growth.One of the few action sports in the Summer Olympic Games, and a good sign that action sports is strong for 2020 now in Tokyo, Buchanan said. So from an action-sports side of things, I think its super positive for the Summer Games.---Online:AP Summer Games site: http://summergames.ap.org/---Follow Genaro Armas at: https://twitter.com/GArmasAP Cheap Jerseys 2020 . The Dutchmans tenure got off to a poor start when referee Guido Winkmann awarded a penalty within two minutes for Niklas Starks clumsy challenge on Alexandru Maxim. White NFL Jerseys Cheap . JOHNS, N. http://www.cheapjerseys.science/ . Neymar curled home a free kick from just outside the area to put the 2014 World Cup host ahead in the 44th minute. 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DAYTONA BEACH, Fla. -- Jamie McMurray had no idea what caused his car to wiggle, wobble and weave at nearly 200 mph Saturday night.Whatever the reason, it triggered The Big One and wrecked more than half the field at Daytona International Speedway.Nearly two dozen cars, including all four Hendrick Motorsports entries, were involved in the massive wreck a little past the halfway point of NASCARs 400-mile race at Daytona.Brad Keselowski won the race, kicking off the famed tracks annual fireworks show at Daytona, but there were plenty of sparks and smoke on Lap 90.All the chaos, confusion and crumpled cars began when McMurray got loose in Turn 1. He moved hard left for some reason, banged into Kyle Larson and then spun in front of much of the field after getting tapped from behind by Jimmie Johnson.I think somebody might have gotten into my left rear, McMurray said. I dont know if that cut the tire down or what, but after I felt that happen, I just didnt have any control any more. It seemed like a tire maybe went down and it actually felt like I hit oil.It is unfortunate, but it is just part of plate racing.The crash included Hendrick teammates Dale Earnhardt Jr., Jimmie Johnson, Kasey Kahne and Chase Elliott as well as Kevin Harvick, Danica Patrick, Kyle Larson, Matt Kenseth, Martin Truex Jr. and pole-sitter Greg Biffle.Just a bunch of cars crashing, Kenseth said. Pretty much that was it.It was a typical result at NASCARs high-banked superspeedways, where carss run in close packs and major mistakes are magnified, but not many crashes involve nearly two dozen cars.ddddddddddddAt Talladega in May, 35 cars were involved in at least one accident. Two cars got airborne, and The Associated Press estimated more than $10 million in damage during the race.Last years July race at Daytona ended with a horrific last-lap accident. Austin Dillons car sailed upside down into the fence then shot back onto the track. The car was on its roof and mangled when it was hit hard by Keselowski.The car tore down a section of fencing, debris scattered into the grandstands and crew members from several teams raced to check on Dillon. He walked away uninjured.Most of the cars stayed on the ground in Saturday nights crash, although Brian Scotts rear wheels lifted off the ground as Harvicks nose slid underneath him.I didnt see a lot, Scott said. We were in the wall and jacked up and I guess (Harvick) came up under me and drove underneath my car and then I was up in the air. It was a pinball effect. It is an unfortunate end. You always seem to get those big ones here in the Fourth of July race. Sometimes there is nothing you can do. There was no chance to ever miss that for our (car).It is just a product of this type of racing. When you are in the pack and there is one wreck ... there is no way for people to escape. 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