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.
Core Muscles. One of the keys to making the most of a rowing machine workout is stabilizing your body and keeping your back straight throughout the entire motion. A straight back will encourage you to contract your abdominal muscles; giving your abs an almost isometric workout.