Pecks
Pectorals
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.
Your chest muscles.
deltoids
Chest muscles
Pectorals
The atissimus obrsi abdominals is the prime mover in a sit up.
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There are two muscles that are in your chest. These two muscles are known as the pectorals major and the pectorals minor.
Triceps and Pectorals
In exercise, probably pectorals. Your chest muscles.