If you’ve ever wondered whether you should hit the treadmill first or lift weights, you’re not alone! Cardio and strength training are two fundamental components of fitness, both are very different and everyone has their preferences whether they like to hit hit the treadmill or get in a good leg day. I will say that many people struggle to determine the right balance between the two. Should you prioritize cardio for heart health, or is building strength the key to long-term fitness? The answer isn’t exactly clear cut, in all honestly, it all depends on your personal goals, body type, and lifestyle.

Understanding how these two forms of exercise impact the body can help you create an effective workout routine. To put it simply, cardio primarily improves endurance, heart function, and calorie burning, while strength training enhances muscle growth, bone density, and metabolic rate. Both are essential for a well-rounded fitness regimen, and neglecting one in favor of the other can lead to imbalances.Take this as an example; You’re training for a marathon, so you dedicate all your time to running. You develop excellent endurance ( ie: being able to run for long periods of time) but you start to notice weakness in your legs and occasional knee pain. On the flip side, if you only lift weights and ignore cardio, you might build impressive muscle but struggle with fatigue when running. This is why finding the right balance is crucial. So the big question is, when should you focus on cardio, and when should strength training take priority?

First lets break it down, Understanding The Difference Between Cardio and Strength Training!

Cardio (AKA: Aerobic Exercise):

Cardio (short for cardiovascular exercise) is any activity that increases your heart rate and keeps it elevated over a period of time. Think running, cycling, swimming, or even dancing! The primary goal is to improve heart and lung health while burning calories.

Pros of Cardio:

• Strengthens the heart
• Strengthens the lungs
• Burns calories
• Helps with fat loss
• Increases endurance
• Improves stamina
• Boosts mood
• Helps to reduces stress

Cons of Cardio:

• Can lead to muscle loss if overdone without strength training
• May cause joint stress if high-impact exercises are overused
• Results can plateau if workouts lack variety

Strength Training (AKA: Resistance Exercise):

Strength training involves lifting weights, using resistance bands, or performing bodyweight exercises in order to build muscle. This type of training focuses on increasing muscle mass, strength, and bone density.

Pros of Strength Training:

• Builds muscle
• Helps to maintain muscle mass
• Strengthens bones
• Improves joint health
• Boosts metabolism ( Fun fact ! More muscle burn more calories at rest)
• Enhances overall functional strength for daily activities

Cons of Strength Training:

• Requires proper form to prevent injuries
• Can lead to muscle soreness if coupled with inadequate rest
• Takes time to see visible results

 A SMALL LITTLE NOTE… Endurance!

Endurance is the ability to sustain physical activity over time, and it’s not just about cardio — it’s a combination of both cardiovascular and muscular strength. While cardio improves your heart and lung capacity to keep you moving longer, strength training builds muscular endurance, allowing your muscles to resist fatigue. Going back to the runner example , they need strong legs to support repetitive impact, just as a weightlifter benefits from a healthy cardiovascular system for recovery between sets. Although my article focuses on when to train cardio and strength separately, endurance highlights why both are essential for overall fitness…. That’s for another time !

BACK TO THE ARTICLE !

When Should You Do Cardio and Strength Training?

If Your Goal is Fat Loss

A combination of both cardio and strength training is ideal. Strength training helps preserve muscle while shedding fat, and cardio burns extra calories. A good approach is to start with strength training and finish with cardio.

If Your Goal is Building Muscle

Prioritize strength training and limit cardio to avoid excessive calorie burn. A light cardio warm-up (5–10 minutes) is fine. This works to get the blood pumping, increase blood flow to your muscles and it’s perfect to start building a light sweat ! But don’t overdo it!

If Your Goal is General Health

For overall wellness, a balance of both is key. You can alternate days or combine them in the same workout depending on your schedule and preference.

How Many Times a Week Should You Train?

Here’s what I know, for a healthy individual, here’s a good weekly breakdown:

• Cardio: 3–5 times per week (20–60 minutes per session, depending on intensity)
• Strength Training: 2–4 times per week (targeting all major muscle groups)
• Rest Days: 1–2 days per week for recovery and muscle repair

Why Both Are Important!

While cardio enhances cardiovascular health and endurance, strength training helps prevent muscle loss, improves bone health, and increases metabolism. Combining both ensures a well-rounded fitness regimen that supports longevity, strength, and energy levels.

Here’s the science behind cardio and strength training!

Cardio and strength training utilize energy in different ways, affecting how your body performs and recovers. Cardio primarily relies on aerobic metabolism, meaning it uses oxygen to break down carbohydrates and fats for sustained energy. This makes it great for endurance but can also deplete energy stores if overdone.

Strength training, on the other hand, depends on anaerobic metabolism, using stored glycogen in the muscles for short bursts of power. This is why lifting weights feels intense but is often followed by rest periods. Understanding these differences can help you structure workouts more effectively — cardio for endurance and fat burning, strength training for muscle growth and metabolic benefits.

Common Mistakes I See People Make When Combining Cardio and Strength:

1. Many people unknowingly sabotage their progress by structuring their workouts inefficiently. One common mistake is doing excessive cardio before strength training, which can leave you too fatigued to lift effectively. If muscle gain is a priority, it’s better to start with weights when energy levels are highest.
2. People often neglect recovery. Overloading both cardio and strength training without proper rest can lead to burnout and injuries.
3. Relying on steady-state cardio alone for fat loss, instead of incorporating strength training, can lead to muscle loss and a slower metabolism. A balanced approach prevents these pitfalls and maximizes results.

Here’s A Sample Weekly Workout Plan!

If you’re unsure how to fit both into your routine, here’s a simple guide based on different goals:

• For Fat Loss: 3–4 days of strength training + 3–5 days of cardio (mix of high and low intensity)
• For Muscle Building: 4–5 days of strength training + 2–3 short cardio sessions (to maintain endurance without hindering gains)
• For General Fitness: 3 days of strength training + 3 days of moderate-intensity cardio (e.g: brisk walking, cycling)