Cyclo-cross is a form of competitive cycling that takes place on a variety of terrains, including grass, dirt, and mud. Races typically involve a circuit of 2.5 to 3.5 kilometers, featuring obstacles like barriers and steep hills. Cyclists ride specialized bikes that are lightweight and have knobby tires for better traction. Racers must navigate the course while dismounting and carrying their bikes over obstacles, making it a physically demanding sport. Cyclo-cross events are usually held in the fall and winter months, attracting both amateur and professional cyclists. The sport emphasizes endurance, skill, and strategy.