Negative Splits: A Middle-Aged, Newbie Runner's Journey to the First MarathonEbookNegative Splits: A Middle-Aged, Newbie Runner's Journey to the First MarathonbyDavid M. WhiteRating: 0 out of 5 stars0 ratingsSave Negative Splits: A Middle-Aged, Newbie Runner's Journey to the First Marathon for later