I always wondered why you have to be in second gear when push starting a car. I know what all the process does, so my thought is that it would be better to do it in first gear.
I think this because in first gear you can have more rpm with less speed (compared to second gear), so that means less effort, less time pushing the car, and therefore, less distance to do it.
In fact, one day it happened to me that my car's battery was dead and I was alone, and as I couldn't gain much speed alone, I tried with first gear and it was perfect!
So, why is it common to hear that "it has to be done in second gear"? Can I break something if I do it in first gear?