You don't have to spend money to download Fit APP, but Fit APP is a sports health software developed by Shanghai Dedong Network Technology Co., Ltd. ... Whether your goal is to lose fat, gain muscle or shape, Fit can tailor your personal fitness and nutritious diet plan according to your fitness foundation and schedule. Therefore, there will be items that need to be spent in the APP, such as private education or tailor-made weight loss plans for yourself, which require extra diplomatic money, but these are not mandatory and you can choose for yourself. If you don't want to spend money, you don't have to choose these projects.