Every now and then we have a thread on here that inspires debate, that challenges our thinking, makes us really question what we believe. This isn't one of them

Some folk drink more water than others. Carrying a bottle or not will make bugger all difference to many runners performance either way. You can get very ill if you don't drink enough fluid and similarly if you drink too much. imho too little is far more common than too much, in most everyday situations :closed: