Does cardio KILL gains or make you stronger?💀/💪

From my personal experience integrating cardio with strength training, I've learned that cardio doesn't necessarily kill your muscle gains if done correctly. In fact, it can be a powerful tool to enhance your overall performance. Cardio acts like the engine of a car—building your cardiovascular capacity improves how efficiently your body uses oxygen and clears metabolic waste. This means you can recover faster between heavy lifts such as squats or deadlifts, allowing you to push harder during strength sessions. One key measure is VO2 max, which reflects your body's ability to utilize oxygen; improving it can help you perform more reps or sets before fatigue sets in. Based on what I found researching and applying techniques, the best approach is to add two types of cardio alongside your regular weight training. The first is low-intensity steady-state cardio (LISS), which is performed at a pace where you can hold a conversation. This builds your aerobic base and mitochondrial density—basically increasing your muscle cells' energy factories—enabling you to handle more total work without burning out. The second type is high-intensity interval training (HIIT). For example, doing 4 minutes of intense effort at about 90% of your max heart rate followed by 3 minutes of active recovery at around 70%. This method pushes your cardiovascular ceiling and improves your nervous system's ability to stay calm and efficient during high-intensity effort, which translates well to lifting heavy weights or completing high-volume sets. In practice, I combined these cardio methods with a four-day strength training split. The results? I built muscle, increased endurance, and even got faster without losing muscle size. Many lifters worry cardio might burn muscle, but the key is volume and intensity management. Cardio done excessively or without proper nutrition might hinder gains, but balanced cardio tailored to support your lifting goals acts as a force multiplier. If your goal is to build muscle and strength, consider integrating measured amounts of cardio to boost recovery and capacity. Track your progress and listen to your body. I've found that by shrewdly adding cardio—especially activities like the Hyrox training method which involves both running and functional fitness—you get stronger, fitter, and less prone to burnout. This balanced approach is sustainable and effective for long-term gains.