ReGym is a mobile app and a web panel for personal trainers, fitness coaches and small training studios. Trainers build training plans from a ready library of 450+ animated exercises, save them as templates and assign them to new clients in seconds. Clients tick off sets during a workout on their phone, and the trainer immediately sees results, weight, measurements and progress photos. Sessions land in a shared calendar, and arrangements stay in the built-in chat instead of private messengers. Trainers can enter results for a client during an in-person session, download a PDF progress report, and give the app their own name and colour (white label). ReGym works in Polish and English, on iPhone, Android and in the browser.