One reason I love Coolsculpting is the incredible safety profile. When you "pinch and inch" you are pinching skin and subcutaneous fat. This is the tissue that is drawn into the Coolsculpting handpiece and is chilled to just above freezing. The fat is particularly sensitive to the cold so it is the only thing affected. Muscle lies below the fat layer and is not drawn into the handpiece. Actually, even if it was it would not be harmed, remember that fat is more sensitive to the cold.
Web reference: http://vandykelaser.com/body/coolsculpting-by-zeltiq/