This is one of the most searched questions in fitness and the answer most people get is frustratingly vague. "Do both" isn't helpful when you have limited time and want to know where to focus first. So let's actually answer it.
What Cardio Does for Fat Loss
Cardio burns calories during the session. A 45-minute moderate run might burn 350–500 calories depending on your size and pace. That's meaningful but it's also the ceiling. Once the session ends, the calorie burn largely stops.
Cardio is also easy to scale up, requires no equipment if you're walking or running, and has well documented benefits for cardiovascular health and mood. For people who are completely sedentary, adding cardio produces fast early results.
What Weight Training Does for Fat Loss
Resistance training burns fewer calories during the session than cardio but it builds muscle, and muscle changes the equation permanently. More muscle means a higher resting metabolic rate, which means your body burns more calories 24 hours a day, not just during workouts.
Weight training also produces the "afterburn" effect (excess post-exercise oxygen consumption), where your body continues burning elevated calories for hours after the session ends. And critically, it preserves lean muscle while you're in a calorie deficit which prevents the metabolic slowdown that makes weight regain so common.
So Which Is Better?
For pure calorie burn in a single session: cardio wins short term. For body composition, metabolism, and long-term fat loss: weight training wins. For most people trying to lose fat and keep it off, the research consistently favors a combination but if you can only do one, resistance training edges out cardio for sustainable results.
The more important variable, though, is consistency. The best exercise is the one you'll actually do week after week. A walking habit you maintain for 90 days beats an intense gym program you abandon after three weeks.
The Part That Determines Your Results
Exercise type matters less than most people think. What matters more is having a clear structure knowing how many sessions per week, at what intensity, combined with the right nutrition framework. Without that structure, most people either do too little to see results or too much to sustain it.
The TX3 90 Day Lean Code includes a movement framework designed to work alongside the nutrition plan so you're not guessing how to combine the two. For $37, it's the complete 90-day system that takes the "what should I do?" question off the table entirely.
Results vary based on individual starting point and consistency. This is not a medical program consult your healthcare provider before beginning any new diet or exercise plan.