I'm looking to swim the channel for charity. It's all in the early stages at the moment and am just planning for it. I'm a competant swimmer, ranging from 40km to 70km a week depending on the training programme. This is normally done over 12 to 20 hours in the pool. However, I have no experience in open water and more importantly I'm a sprinter, specialising in the 50 and 100m Backstroke. Thus, this brings me to my question...does anyone know the training for a swim like this? Whether I'm on the right track and doing enough a week or do I need to do more than say 40km? Has anyone swum the channel?