It would infact be Motocross number one, and Soccer second. Please see related link below! The National Sport Health Institute in Englewood, California tested several professional motocross racers in the early 1980s as part of a comparative study of the cardio-vascular fitness of athletes from various disciplines. Athletes from track, American football and soccer were tested, among others. Motocross racers get their heart rate up to around 180 to 190 beats per minute and hold it there for about 35 minutes. Another thing to consider is that they do this twice per day (Original article appeared in DirtBike magazine in 1980). A subsequent study by the University of Pittsburgh Medical Center's Sports Performance Complex in 2002 reconfirmed the result with more recent motocross racers. The intense physical demand of motocross derives from the fact that the racer of the bike must keep complete control of a 200+ pound bike, while also maintaining their top speed throughout the race.
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some call it a sport and others call it an Obsession. Most riders who take the sport seriously have a coach. Many riders also are on teams. hey are still sports and Motocross is considered to be one of the most strenuous sports