bieganie po schodach and other 65,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
The icon for "wakeup hill on stairs" shows the outline of a man walking up stars. The stairs are shown as zig-zag lines, running from the bottom left of the image upwards to the top right. The man appears to be in motion.