The Hour Record is when cyclists try to ride as far as they can in one hour on a track (kind of like a big circle). Think of it like a race against time - the cyclist tries to ride faster and farther than anyone else in one hour. It's very difficult because the cyclist has to keep going without stopping for a whole hour, and can't use any special equipment like a motor or a battery to help them. They have to pedal as hard as they can all by themselves. It's like running a really long race but on a bike!