Vigorous exercise, rigorous science: What scientists learned from firefighters in training

Eleven young firefighters went through a rigorous training exercise, carrying up to 40 pounds of gear over hilly terrain during a 45-minute training exercise in the California sun. Gloves, helmets, flashlights, goggles, and more weighed them down as they sprinted through the countryside wearing fire-resistant clothing to show they were ready to serve as wildland firefighters.