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Pectus excavatum, also known as "sunken chest," and pectus carinatum, also known as "pigeon chest," are two conditions that affect the shape of the chest. Pectus excavatum is characterized by a depression in the chest, while pectus carinatum is characterized by a protrusion of the chest. Various factors, including genetics and structural abnormalities in the rib cage, can cause both conditions.

Resistance training can be a great way to improve both pectus excavatum and pectus carinatum, as it can help to strengthen and tone the muscles of the chest, back, and core. However, it is crucial to be mindful of proper form and technique when performing exercises, as improper form can exacerbate the condition.

For individuals with pectus excavatum, exercises that focus on the upper body, such as push-ups, bench presses, and rows, can be particularly beneficial. It is also important to incorporate exercises that strengthen the core, such as planks and mountain climbers, as a strong core can help to improve posture and support the chest.

For individuals with pectus carinatum, exercises that focus on the chest and back muscles, such as push-ups, bench presses, and rows, can help improve the appearance of the chest. 

It is also important to incorporate exercises that strengthen the core and improve posture, such as planks and mountain climbers.

It is essential to consult with a healthcare professional or a certified personal trainer before starting a new resistance training program, as they can guide the best exercises and techniques for your specific condition. In addition, surgery may sometimes be recommended to correct pectus excavatum or pectus carinatum.