Starting airplane engines is a whole topic on Wikipedia. I did not know this was such an expanded field of expertise, so it appears doodling all day may have it’s benefits after all. I’ll let my boss know. Anyway, a pull cord is used for certain motors as best explained:
“…small two-stroke engines with no starting system, for ground testing, a cord is wrapped around the propeller boss and pulled rapidly in conjunction with operating decompressor valves [do not use a snake].” Wikipedia, Aircraft Engine Starting. (I edited the snake part for clarity).
I’m a fan of the good ole propeller swing myself. Got to dress the part, though. And, if you’re a expert – no helmet. A fun picture below (also swiped from Wikipedia) shows the camaraderie of swingers past.