I noticed that for racing off road motor cycles. They kick start them instead of carrying a battery/started motor. Or old time movies where people started air

I noticed that for racing off road motor cycles. They kick start them instead of carrying a battery/started motor. Or old time movies where people started airplanes by spinning the propeller by hand “airplane hand prop” Seems dangerous... https://www.quora.com/How-can-I-hand-prop-planes-Is-it-possible-to-hand-prop-every-plane https://www.quora.com/How-can-I-hand-prop-planes-Is-it-possi...