No lower than the middle of your shoulder blades.
As your mower ages and starts to show signs of a lot of use, the mower blades will often wear and become what is known as rounded. This rounding of the blades causes there to be a slight gap between where the blades would normally meet up and cut the grass, causing them to miss a small patch of grass in the middle. The best solution is to replace your mowers blades.
The trapezius muscle has three parts: the upper fibers (descending from the skull to the upper back), the middle fibers (running horizontally across the upper back), and the lower fibers (ascending from the middle back to the shoulder blades).
It's hair that's between shoulder level and the middle of the back.
The muscle located in the upper part of your back in the middle is called the trapezius muscle. It is a large, triangular muscle that extends from the base of your skull down to the middle of your spine and across to your shoulders. Its primary function is to move and stabilize the shoulder blades.
The thoracic or "T" vertebrea count from the top down. T4 and T5 are located in the approximate middle of the thoracic region of the spine (or chest area) so t4-t5 or about between your shoulder blades. there are 12 thoracic vertebrea counting from 1 to 12, top to bottom.
The literature and science
The muscle that covers the back of the neck and upper middle region of the back is the trapezius. This large, triangular muscle extends from the base of the skull down to the middle of the back and out to the shoulders. It plays a crucial role in moving, rotating, and stabilizing the shoulder blades, as well as supporting the neck.
Retraction of the scapula refers to the movement of the shoulder blades (scapulae) towards the spine. This action is typically performed by muscles such as the rhomboids and middle trapezius. It is important for maintaining proper posture and stabilizing the shoulder during various activities, like lifting or pulling motions. Strengthening the muscles responsible for scapular retraction can help prevent shoulder injuries and improve overall upper body function.
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The trapezius is a large, triangular-shaped muscle located in the upper back and neck. It extends from the base of the skull down to the middle of the back and spans laterally to the shoulder blades. The muscle can be divided into three parts: the upper, middle, and lower fibers, each serving different functions in shoulder and neck movement. Its overall size can vary among individuals, but it generally covers a significant area of the upper posterior torso.
The middle part of the deltoid abducts the shoulder, as well as shoulder abduction at the supraspinatus and biceps brachii muscles.