Comment by Broken_Hippo

"Aerobic exercise is great for health but it mostly doesn’t change anyone’s “shape”"

This just isn't true. It generally won't take away fat, but lifting weights won't remove the fat either (it doesn't matter how strong your stomach is, you aren't seeing it if you have a layer of fat on top). But if you are already thin - or thinner in places - most of the aerobic exercise will build appropriate muscle. Walking makes for changes in the lower half of the body, for example. It still won't make you look like you lift weights, true, but there is still change.