Cyclocross is cross-country bicycle racing. Racers spend only part of a race on their bikes because only part of the two-mile race is smooth. Other parts of the race have the challenge of obstacles (障碍). When racers reach them, they can ride over them, or pick up their bikes and run.  

 To be a top racer, you must dismount without slowing down at all. To do this, swing your right leg over the bike seat. At the same time, move the bike away from your body. This makes room for your right foot to hit the ground next to your left foot. As your right foot nears the ground, take your left foot away from the bike. Put both feet on the ground and start running! 

As soon as you are running, you have to decide what to do with your bike. You may shoulder it or lift it. It's important to practice both skills. Sometimes you need to run fast and jump over some obstacles. As your feet hit the ground, you reach down and catch the bottom of your bike. Lift up carefully and keep the bike on your right shoulder while you run. Sometimes you may lift your bike. You catch the top of your bike. Then you lift the bike high enough to get over the obstacles and carefully put the bike on the ground.

 After you have carried your bike across an obstacle, you will need to remount. As soon as your bike is on the ground, push off with your left leg, swing your right leg over the bike seat, and move into riding position. Remounting can be the hardest skill of cyclocross. You can learn by watching someone who remounts well.  

 Cyclocross is a great way to stay active and have fun. However, it can be dangerous. Make sure that you are well prepared. Then, you will just need to go!