Swimmers must be able to confidently swim front crawl, back crawl, and breaststroke unaided for at least 25 metres and butterfly for at least 10 metres maintaining good technique throughout to join an Advanced class. During lessons swimmers will continue to develop technique for all four strokes and will also begin to include starts and turns for all four strokes during their swims. Distance swims will be introduced to improve stamina and overall fitness. The maximum number of swimmers per Advanced class is eight.