While I've always run heel first when using shoes, when running barefoot perhaps unconciously I've always gone ball/toes first - I guess it really is what comes

While I've always run heel first when using shoes, when running barefoot perhaps unconciously I've always gone ball/toes first - I guess it really is what comes naturally. There was also another article a while back that perked my interest with a bit about runners in South or Central America who would go ultra-long distance running with only a thin slice of rubber strapped to their feet.