“],”filter”:{“nextExceptions”:”img, blockquote, div”,”nextContainsExceptions”:”img, blockquote, a.btn, a.o-button”},”renderIntial”:true,”wordCount”:350}”> Dear Sundog: For several years I’ve crewed for a semiprofessional ultrarunner. He isn’t a very close friend, but I like working with him. Sometimes I pace him, and the aid stations are a good time. A few others also crew—we don’t get paid,…