The public footpaths that let you wander so easily over the English countryside sometimes take you through a farmer's land. To make sure that his land is protected and any animals that might be grazing there are kept in, the entrance will be across a style. This is not like a gate that could inadvertently be left open but a wooden structure with a step to climb over. Nowadays there are also kissing gates which allow you to enter a field by passing through a swing gate and also to kiss your partner as you each go through.
Today hopping over a style I thought of a nursery rhyme.