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.
A group of muscles called the erector spinae -- sometimes referred to as your sacrospinal muscle group -- supports your spine. Your glutes consist of the gluteus maximus, gluteus medius and gluteus minimus. These muscles make up your buttocks, with the gluteus maximus being the largest muscle in the human body. Your abs and obliques work together with your lower back and glutes to help you rotate, balance and stabilize the body during sitting and standing. The Effect of Seat Variables. Variables such as seat height and the presence of arm rests effects how you sit or stand.