With an ultra planned for next year (65m), and a build up plan starting with the Rosedale 30m this coming weekend, I decided it was time to get a little more serious about hydration.
So, today I set out to calculate weight loss through sweat. Over 12.4 miles I lost 5.5 pounds. That seems to equate to 200ml per mile of fluid intake required.
I've either miscalulated or have previously significantly underestimated my hydration needs.
Does this rate seem about right to anyone else who has worked this out?