Systematically undercounts my steps. It is not helped by the fact that the info comes from my relatively accurate activity tracker with GPS data. Somehow Fit then still "corrects" my steps off by 25-35%. An unacceptable heap of trash. Just trust the damn data coming from a dedicated device instead of supplementing it with inaccurate readings from my phone. Whenever I leave my phone behind it straight up ignores any steps made during that period. Thanks. Idiots.