The last app update includes a new difficulty scale, making it easier to choose a suitable video according to your level.
The difficulty is based on the evaluated spent energy for each video, so we take into account, the distance, the duration, the elevation and the pace of the contributor.
For example, a level 1 video is composed of a small distance and almost no elevation, whereas a level 5 video has a longer distance, generally more elevation gain, and a higher pace.
The best way to set your level is to test a video on each difficulty. Then, once several videos from the same level become easy, you can train to the next level.