The Ironman triathlon competition is the ultimate test of endurance. Find out how competitors train and compete in such a gruelling event in this exciting photographic non-fiction report by Mary Colson. • Collins Big Cat Progress books are specifically designed for children at Key Stage 2 who have a Key Stage 1 reading level, giving them age-appropriate texts that they can read, building their confidence and fostering positive attitudes towards reading. • Text type: An information book • Curriculum links: P.E.