New year gym started , one question

[cameraman]

From my observation , why most of the fit ladies have flat chest but rest of their body looks great?

Does their chest shrink due to fat loss?

[veerigadu]

Fat loss is one reason. Also Boobiessss are smooth muscles for the most part. Whereas thighs, hips etc are skeletal muscles. these skeletal muscles are attached to bone and also their muscle fibers organization is different

Smooth and skeletal muscles have different kind of muscle fibers in them.