Mark Durnford is one of the UK's leading personal trainers and swimming coaches who also works as a consultant, presenter and lecturer to the fitness industry, regularly contributing articles to both public and professional health & fitness media. Author of a series of the first video Interactive Swimming books for smartphones & tablets, along with writing many of the education manuals being used today by Trainers & Coaches of the future. Mark has taken his competitive swimming career to top levels and has since been coaching swimming at all levels for many years. It is within his books that he shares this experience providing a simple to understand approach with the backup of instant video footage of the technique to follow really bringing the text alive.