Active gaming is a form of video gaming that requires full body motion or varying degrees of physical activity to play a game. While active gaming has gained momentum, there is a lack of studies that provide insight on how they should be designed, specifically components of active games make them engaging. This study identifies, analyzes and categorizes specific design mechanics and features used in active games. It answers the question: Which, if any, game mechanics and features can a panel of experts in academia, health and the game industry agree on as valuable and impactful to the construction of successful and engaging active games? Using a Delphi study, nine experts answered questions related to active gaming. They reached agreement on 20 of the 21 inquiries regarding game design focused on motivation, social influences and flow. Their feedback offers recommendations on the design of future active games, and identifies emerging trends. This study shares their notes, and translates the findings into specific recommendations for developers on the design of active games. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]