Barefoot Secrets from Grunts and Seals

The key to light, easy running is rhythm, and that's a secret that combat forces have known for thousands of years. Roman centurions used to cover 50 miles in a single night, running with one hand holding their weapons and the other on the shoulder of the soldier ahead of them. That kind of close-quarters striding demands a quick, left-right-left-right rhythm: you'd either kick the guy ahead of you or get kicked by the guy behind if you didn't get your feet up fast. No way, in other words...