In the second scene of La Traviata Anna Netrebko walks along the top of the sofa. Now that we know she studied gymnastics, we recognize that these are balance beam maneuvers. She stands securely on one foot while Rolando grasps the other foot. She does an acceptable dismount, considering it's an opera and not a competition.
Gymnastics training for opera singers? It does sound a little severe. It is not good for a singer to grunt like Maria Sharapova, but physical training can only do good. Pavarotti played tennis. Cecilia Bartoli was a Flamenco dancer. Rolando Villazon works out. Anna Netrebko jogs. Get physical. It can't hurt.
A couple more shows
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