The app is for the members of the association and its instructors. Members can apply for and unsubscribe from team training, and see who is registered for the training. It can be used for team training within eg fitness, badminton, handball and the like.
The app is also for the association's instructors, who via the app can make checkers of attending members, and send messages to the members on the teams that the instructor is attached to. The instructor can also register hours in the app, and the association can subsequently make an inventory of registered hours - eg on a monthly basis.
Checking members is a good tool for team training with especially children, where the children do not themselves notify in advance whether they come or not.