Swimmers must be able to confidently swim front crawl, back crawl, and breaststroke unaided for at least 10 metres and butterfly for at least 5 metres to join an Improver class. The lessons take place in the deep end of the pool. During lessons swimmers will continue to build on technique for all four strokes along with developing aquatic skills such as sculling, handstands and somersaults in preparation for stroke turns. The maximum number of swimmers per Improver class is six.