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Tags: Aerobic exercise, Auto Racing, Bicycle pedal, Bicycle racing, bike racing, Cycling, Cyclo-cross, Cyclocross, Fitness, Health, Heart rate, High-intensity interval training, Interval training, Motorsports, Mountain bike, Mountain biking, Muscle, Personal Training, Physical exercise, Physical fitness, Race (classification of humans), Racing, Spin (magazine), Sport, Sprint, Sprint Nextel, XC Racing