What should runners always carry during training and racing?

Runners should always carry emergency contact information during training and racing to ensure safety. This information provides critical identifying details that can assist race officials or medical personnel in case of an emergency. It can include names and phone numbers of people who should be contacted if a runner experiences a medical issue or cannot communicate. Having this information readily available helps ensure timely assistance and can provide peace of mind to the runner.

While the other options, such as nutrition information, water bottles, and running logs, are also important for various reasons, they do not carry the same emergency safety implications. Nutrition information is beneficial for planning and fueling, water bottles are essential for hydration, and running logs help track progress, but none are as critical as having a way to communicate who should be contacted in case of an emergency situation.