Cyclo-cross is a way of riding a bicycle off-road over a short and winding course that has obstacles like steep hills, sharp turns, and even barriers you have to jump over.
It's kind of like a mix between mountain biking and obstacle course racing. The bikes are specially made with knobby tires for better traction on dirt and mud, and the handlebars are curved to give riders more control and better grip.
The races usually take place in the fall and winter, so the weather can be cold, muddy, and wet.
Riders have to be strong and fast, but also have good bike handling skills and strategy because the course can be very challenging. And because there are obstacles, it's often necessary for riders to jump off their bikes, sprint a short distance while carrying their bikes, and then jump back on and keep going.
It's a really exciting and fun sport to watch and it works out your whole body - plus, it can be a great way to enjoy the outdoors and stay active during the colder months of the year.