Your chest muscles.
The antagonists to the pectorals are the muscles in the upper back, specifically the rhomboids and trapezius. These muscles work in opposition to the pectorals to allow for controlled movement and to prevent injury.
The pectorals are muscles that are considered to be organs. They are fan shaped muscles that are located in the anterior chest.
Chest muscles
Pecks
deltoids
The atissimus obrsi abdominals is the prime mover in a sit up.
Pectorals
Pectorals
There are two muscles that are in your chest. These two muscles are known as the pectorals major and the pectorals minor.
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On each side of the anterior of the thorax you have a superficial pectoralis major and a slightly deeper pectoralis minor. There are also the muscles between the ribs called the intercostals, (external, internal and innermost)
The muscle that is located on the ventral (anterior) side of the body is the pectorals major. The pectorals major is located in the chest of the human body/