the most common way to push start a vehicle is to put the manual transmission in second gear typically, switching the ignition to on/run, depressing the clutch, and pushing the vehicle until it is at a speed of or more, then quickly releasing the clutch to make the engine rotate and fire, then quickly depressing the clutch so it does not stall. this is done by one person pushing a lightweight automobile, pulling or being pushed by another vehicle or even rolling down a hill.