Legal, Maybe Not Provable. Entering into an oral contract is one thing, but proving that the contract exists, or that specific terms of the contract exist, is entirely different. Oral contracts are legally dangerous, because there is no concrete record of their existence.
The classic ballet move, the pirouette, is a complete 360-degree turn performed on one leg. In a ballet, it is usually done more than one time, in a twirling motion. Leg muscles used in a pirouette are the calves, hamstrings and quadriceps.
The muscles used in this exercise are the chest, shoulders, upper back, lower back, and glutes. As the planche is a demanding position, athletes train for it with a progression of simpler moves, advancing to the next (and finally the planche) when they have gained mastery of the intermediate positions.