The 'Galpin equation' for fluid intake during exercise is to divide body weight in pounds by 30 and consume that amount in ounces every 15-20 minutes.

“Remember, these are averages, so that's what you want to average around a particular activity. These not strict recommendations where a buzzer goes off and every 15 minutes you have to chug that exact amount of electrolyte-containing solution.”

“specific recommendation based on the Galpin equation that you should ingest your body weight in pounds divided by 30. That's how many ounces of fluid you should drink every 15 minutes”

“the Galpin equation for how much fluid to ingest during exercise is you want to take your body weight in pounds and divide that by 30 and you want to consume that number which would be in ounces about every 15 to 20 minutes”