Do you put down your right or left hand first on round-off?
Are you a a right or left twister on saltos in the air?
It has something to do with the differences between the right and left sides of your brain.
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related – Bill Sands’ study of 171 high level WAG gymnasts indicated that right hand first on roundoff gymnasts tend to twist to the right in the air. Left hand first gymnasts tend to twist left. That means the majority are able to compete Kasamatsu vault. (A minority would compete the more difficult Tsukahara full.)
In Men’s Artistic that percentage is even higher. Certainly well over 90% of male gymnasts can do Kasamatsu.
Gymnastics Coaching.com 