In 'On Yer Bike', five contestants race each other round a track on children's tricycles.
When the starting flag is waved, the contestants have to cycle along to, and up, a seesaw. When there's enough weight on the other side it will tip down allowing the contestants to carry on along the track. Anyone who hasn't got onto the see-saw will have to wait for it to tip back down the other way to be able to move any further.
After turning a corner, the track goes uphill and gets very narrow. As contestants pass over the top of the hill, steam blows up from under the track. This fogs the contestant's view, and shocks some, so they need to be careful to keep balance.
The track ramps back downhill into a corner. At this corner is a pond. If the contestants come down the ramp too fast they'll end up rolling off the track and into the water.
Finally, the contestants cycle round the rest of the turning track to reach a second seesaw. Again, this will tip up when enough weight is on the raised end, allowing the contestants to reach the finishing line.
The contestant that reaches the finishing line first is the winner.