2 hours without a drink-break? If this happens regularly it clearly shows the instructor has NO IDEA! You should leave a dojo like that immediately. It is important to learn how to re-hydrate your-self by drinking regularly throughout the day, but with intense training, drink breaks are essential to maintaining a high level of knowledge retention - as well as being essential to the correction functioning of the body. I understand how some people can be a little soft, and every time it gets a bit tough - they need a break.. but this is different How many profession sportsmen, in any sport, play for 2 hours with no break? ... Last night, I trained for 2 hours. It was 35C with a humidity of around 80-90%. We had four 2-min drink breaks. Without those, no-one could have made it through the session.