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Tags: Aerobic exercise, Bicycle pedal, Bicycle racing, bike racing, Can opener, Cooling down, Cycling, Cyclo-cross, Cyclocross, Double track, Fitness, Gear, Health, Heart rate, High-intensity interval training, Interval training, Motorcycle Racing, Mountain biking, Muscle, Personal Training, Physical exercise, Physical fitness, Races, Racing, Riders and Teams, Speed, Starting gate, XC Racing