Many years' teaching experience of Kyushu Heroes' Club in China somersault training base tells you that backflips can kill people, and the most vulnerable part of the human body is the neck. Backflip usually happens to freshmen, and they learn quickly at first, then their muscles get tired, they lose feeling, fear, and they get out of control in the air, and they fall off after half a turn! So for freshmen, I must first protect the handspring after 2000 somersaults in the sponge pool. After the muscle fatigue period, the body adapts, and then practice backflips! The number of turns is more, the muscles are adapted, a little tired, but absolutely safe!
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