Is Lifting Enough, or Do You Actually Need Cardio?
In a Nutshell
You can skip dedicated cardio without major short-term effects if you lift weights 4+ days weekly, walk 8,000–12,000 steps daily, stay lean (under 15% body fat for men, under 22% for women), and already include some breathless exertion in your training. However, long-term health markers like blood pressure and blood sugar may decline without it, and the minimum effective dose for cardiovascular health is three 20-minute intense sessions per week. For optimal longevity, add this cardio—even if you can technically skip it—while those with low daily steps, higher body fat, or less intense lifting should prioritize it.
These notes were generated by AI and may contain inaccuracies.
In the pursuit of fitness and health, people track macronutrients, sleep well, train with weights, and perform cardio exercises. The question is what happens if cardio is completely eliminated while maintaining physical activity, weight training, good sleep, and nutrition.
Physical activity encompasses any movement, including small daily tasks like moving objects around. Aerobic activity is a subset involving cyclical movements like brisk walking that engage large muscles and train the aerobic system. Cardio, for this context, refers to aerobic activity that raises heart rate above approximately 130 beats per minute with the explicit intention of improving cardiorespiratory fitness or health.
The scenario involves continuing to walk 8,000 to 12,000 steps daily, lifting weights, sleeping well, and eating well, but removing any purposeful cardio exercise designed to improve fitness.
Fat loss requires a sustained calorie deficit. If the treadmill was generating this deficit, fat loss will slow. However, the deficit itself is what matters most. Two options exist to maintain fat loss: increase general non-cardio activity like daily steps, or reduce food intake by removing fats or carbohydrates while maintaining protein and vegetables. The slimmest people in the world often achieve leanness through walking and calorie restriction rather than strenuous running or cycling.
Initially, little changes when stopping cardio while maintaining 8,000 to 12,000 daily steps, weight training, good diet, and sleep. Over time, however, blood pressure may rise and blood sugar levels may be negatively affected. These small effects accumulate over years or decades, impacting health and longevity.
Traditional weightlifting with sets of 5 to 15 repetitions does not provide enough metabolic demand to replace cardio, though it is better than nothing. However, sets of 15 to 30 repetitions in compound movements with very short or no rest periods qualify as effective cardio training. For general health, this approach can replace dedicated cardio, but for optimal cardiovascular performance, dedicated cardio remains necessary.
Regular cardio improves insulin sensitivity and working capacity, potentially enhancing recovery between sets and sessions. However, walking 8,000 to 12,000 steps daily combined with regular weightlifting already maximizes insulin sensitivity. The most efficient way to improve working capacity for weightlifting is through more weightlifting itself. Eliminating cardio will not affect muscle gains when maintaining these habits.
If training involves large compound exercises with short rest periods and high repetitions, such as 20-repetition near-failure leg presses followed immediately by 20-repetition near-failure push-ups, stopping cardio will affect recovery speed and total work capacity. For traditional training with sets of 5 to 15 repetitions and longer rest periods, the decline in cardiovascular fitness from stopping cardio is unlikely to significantly impact performance.
In normal daily activities like walking to the car, carrying groceries, or climbing building stairs, little difference will be noticed. However, in situations requiring more effort, such as walking up a 10-degree incline for hundreds of meters or climbing 300 steps at a beach, breathing difficulty and the need for breaks will become apparent.
Research indicates that three 20-minute weekly sessions of cardio that leave you "speechless" represents a strong minimum to obtain the main benefits. Anything less is not ideal, while anything more provides additional benefits but not by a large margin.
Healthy individuals without disease symptoms, with normal health indicators, who weight train seriously four or more days per week with exercises causing shortness of breath, walk 8,000 to 12,000 steps daily, eat healthily, maintain low body fat (under 15% for men, under 22% for women), and engage in breathlessness-inducing physical activity for 20+ minutes multiple times weekly can skip dedicated cardio. Activities like Brazilian Jiu-Jitsu or compound weightlifting with short rest periods fulfill this requirement.
People whose doctors indicate suboptimal heart health for their age need cardio. Those whose weight training consists mostly of 10 repetitions or fewer with long rest periods need cardio. Individuals taking fewer than 8,000 steps daily definitely need cardio. Those with body fat percentages of 15% or higher for men and 22% or higher for women benefit from cardio, especially if they lack weekly periods of 20+ minutes of breathlessness-inducing exertion.
It is acceptable to skip cardio if active, lean, healthy, and lifting weights regularly and intensely, though this is not ideal for long-term health. Adding three weekly 20-minute intensive cardio sessions provides maximum long-term health benefits and can be performed after weight training, preferably on upper body days. Increasing to one hour of intense cardio five times weekly yields nearly maximum benefits, with additional cardio primarily improving sport-specific performance rather than longevity. Combining unrelated compound exercises at the gym three to five days weekly represents the most effective approach for maintaining overall physical fitness.
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