Ice Water in my Veins

This morning had to be one of the coldest mornings I've ever had to endure during one of my long marathon training runs. The temperature was 17 degrees when I started my 19-mile run at 5 a.m. By the time I finished roughtly three-and-a-half hours later, the temperature was still below freezing, climbing to 25 degrees. The below-freezing temperatures caused the water in my water bottles to freeze, so I had ice water on the run. I've never had that happen before.