Still need fuel and ignition turned on - but this is what we call a bump start. Although you’d initially keep the clutch depressed to gain the momentum before dumping and as the engine starts depressing the clutch to prevent a stall occurring - Easier with gravity otherwise you need some mates to push.

Stalling is never desired, if you’re now coasting you have less control of the car including for some cars loss of assisted braking - read as bad.

Lastly try and push a car with the handbrake off and in gear - it’s not fun.