Instruct: Classify the given review into positive or negative sentiment.
Query: Superb Insight Into Master's Running

Dallas Smith is an outstanding Master's runner, who is able to eloquently describe both the joys and agonies of competitive running as one enters the golden years of life. I thoroughly enjoyed this book and Dallas serves as an inspiration to those of us attempting to hang on to our waning competitive abilities as the years roll on. Great writing and terrific running.