Answer
Arthur Akopyan, a renowned gymnastics coach, played a pivotal role in helping American gymnast Simone Biles perfect the Amanar vault. With his expertise and guidance, Biles was able to master the highly difficult and dangerous vault, which involves a roundoff onto the vaulting table, followed by a backflip with a full twist. This vault is named after the Romanian gymnast Daniela Silivaș, who first performed it in 1989.