I have been using the app for about 12 weeks now. I really like the overall concept. However, with every update there are only a few tweeks which are either not really necessary or just fixing something while breaking something else or just removing buggy features. Now the app crashes about every second time I open one of its menus on my iPhone X (iOS 15.0.2). The X3 product is simple, beautiful and easy to use and so should be the app. I really hope this app, which could easily be a wonderful addition to any X3 workout, will one day receive the bug fixes it deserves…