Spinervals The Uphill Grind DVD. Hills are a fickle lover. One day you'll be flying up that 11% grade that you normally suffer through, while the next day will have you ready to collapse after a little roller. We can help you change that though with the Spinervals Uphill Grind training DVD. This DVD will have you training alongside U.S. Olumpic Triathlete Joana Zeiger as she prepares to dish out some pain at a world class competition. Even though it's only a video she'll still probably drop you, but you'll also be sweating like a dog and developing some hill climbing strength along the way.