We are witnessing an evolution in healthcare: the emergence of fitness-related data as a vital sign. This is a natural evolution, as fitness-related data is more closely correlated with true health and wellness than traditional health data. Combine these two types of data, and new utilities emerge that are key to effective, comprehensive care. All of this data is generated in the Global Digital Health Market, which is still in its early, formative stages and projected to double over the next five years. Already, 2017 was a landmark year for this market, as mobile health & fitness app downloads topped 3.7 billion, creating 118 billion USD in value. The Global Digital Health Market is creating lakes of untapped and underutilized data that can be used to save lives.