Originally Posted by
Doohickie
Does riding a heavier bike over the same course, the same distance, at the same speed mean you get a better workout? Yes.
Get a lighter bike and ride a tiny bit faster. There is no reason to constrain speed as a parameter. It makes no sense to get a heavier bike for this purpose. You "choose" a heavier bike because it's cheaper or it needs to be heavier for its purpose (eg, touring).