To see abdominal muscles, a person needs to have a low enough level of fat over the abdomen and enough muscle mass in the rectus abdominis.
Evidence from Studies
Supporting (3)
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This study found that people with thicker stomach muscles had fewer health problems after surgery, which supports the idea that having strong, thick abdominal muscles matters — even if it didn’t measure body fat.
Effects of Pilates on inter-recti distance, thickness of rectus abdominis, waist circumference and abdominal muscle endurance in primiparous women
This study found that doing Pilates made women’s stomach muscles thicker and their waists smaller, which means they’re likely losing fat and building muscle — two things needed to see abs.
The Effects of Functional Magnetic Stimulation on Rectus Abdominis Muscle Size and Abdominal Subcutaneous Adipose Tissue Thickness
This study showed that when people used a special machine to make their abs contract, their stomach muscles got bigger and their belly fat got thinner—exactly what you need to see your abs.
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.