The phrase "marathon days" means very long and exhausting days, just like running a marathon which requires a lot of stamina and endurance. Full definition
You are saying that carbs turn to sugar and will store as fat if not running marathons all day long. (nutritionfacts.org)
Learn how you can prepare your kids and the rest of your clan for the back - to - school chaos.Just as your family was relishing in barbequed dinners on the deck, sleeping late, catching fireflies at night and spending marathon days at the pool, it's time for the school year to... more (care.com)
Can't believe you're only 4 weeks away from marathon day. (mommyrunfast.com)