Everyone knows it, youre at the gym and dont know exactly what to do, or youre not quite sure anymore how to perform the exercise and what to watch out for in doing so. You type something into youtube and you get a video. It starts with 2 commercials, after which someone is talking for 4 minutes. When he/she just wants to show you the exercise, 2 more commercials pop up first. So we experienced this problem as well. For this we designed an app with short but very powerful videos. There are no advertisements in the videos, and the app is free to download.