What’s Better: Weights or Cardio ? This is one of the most common questions I hear when people start a fitness program:  “What’s better — lifting weights or doing cardio?” Before I give you the answer, it’s important to understand that these two types of training are very different , and they serve different purposes  in your body. What Cardio Really Does Cardiovascular training focuses on your heart and lungs . Its main role is to improve how efficiently your body delivers b