If you're new to working out, both parts of your chest muscle might grow about the same when you lift weights.
Evidence from Studies
Supporting (2)
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The study found that both upper and lower parts of the chest muscle grew about the same amount after chest exercises in beginners, which supports the claim.
Pectoralis Clavicular and Sternocostal Thicknesses Increase Similarly in Response to One and Three Sets of Pec Deck Resistance Training in Untrained Young Men
The study found that both upper and lower parts of the chest muscle grow similarly when untrained men do chest exercises, which supports the idea that both parts respond equally to training.
Contradicting (0)
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Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.