If you do not want a standard female or male avatar next to your username, Activy allows you to set your own avatar.
Enter settings (gear icon in top left corner), and choose „Profile settings”, click on the white pencil displayed on a blue background, in the top right corner. At the top, in the middle, you will see a circle. Click on it and the app will redirect you to a gallery, where you will be able to choose an image. That image will be made visible in the rankings, next to you username. The next and last step is selecting the borders of the image and confirming your choice.
It is important, at the very end, to click on „Save” (in the top right corner). Otherwise, all the effort will go to waste.