Many of my exercises originated from the long years I spent as an active swimmer or from the many years as a coach in Bamberg, Sydney and Hamburg. The most exercises I use are also found in literature. Out of all these
books about swimming and crawl technique, I would like to recommend three books and one film that I am really convinced about.

Freestyle – made easy – This DVD shows in 42 minutes everything in detail – entry, catch, finish, exit and recovery. A nice complement to the Freestyle Optimizer, but different.
Total Immersion: The Revolutionary Way To Swim Better, Faster, and Easier – Terry Laughlin & John Delves developed this 320 pages containing guide to improving your swimming from an expert with more than thirty years of experience in the water.
Swim Speed Secrets for Swimmers and Triathletes – On 212 pages Sheila Taormina provides you with the best drills to cultivate a more sensitive feel for the water including his secrets that helped him perform at a world-class level for two decades.