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A fit woman I knew with a big butt had to stop the stair machine because it made her butt bigger. I tried it and it didn't do it for me. If you have the genetically big butt, it likes to stay big, whereas no-butt women like me can't make it happen to save our lives.
But that was my point! She likes her big butt, her men like her big butt, so why shouldn't she not only keep it, but keep it riding way up high and tight for years to come? Good heart health being a beneficial side effect, she can have it all!