ViriliTrex So here's the new fat burning equation. This applies whether you're trying to lose weight or not. Heavy weights plus intense cardio will change your body composition and fitness level, which in turn will create significant "physiological adaptations" at the cellular level. This will create a more efficient fat-burning environment, which will ultimately lead to body transformation. When you diet to lose weight, you're just temporarily changing your body weight, not it's composition (fat to muscle ratio). When you create significant changes to your internal systems, however, this puts you in a different league. And the research is very clear that trained athletes burn fat more efficiently and burn more of it than the untrained.