How Much Strength Training vs Cardio You Need

Everyone · Explainer · Updated October 1, 2026 · LearnLife Editorial

What is the difference between strength training and cardio?

Strength training and cardio are two fundamental types of exercise, each serving distinct roles in physical fitness. Strength training, also known as resistance training, involves exercises designed to increase muscle strength and size by working against some form of resistance. This resistance can come from free weights, machines, resistance bands, or bodyweight exercises like push-ups, squats, or lunges. The goal is to create small muscle fiber tears that rebuild stronger during recovery. Strength training not only builds muscle but also improves bone density, joint function, and metabolism.

On the other hand, cardio, short for cardiovascular exercise, centers on activities that raise your heart rate and keep it elevated over a period. This includes walking, jogging, cycling, swimming, dancing, or aerobic classes. Cardio improves heart and lung health, enhances stamina, and helps burn calories during activity. Unlike strength training, cardio generally does not build significant muscle mass but is key for cardiovascular endurance and calorie expenditure.

To illustrate, imagine a person spends 30 minutes running three times a week. They improve their cardiovascular system by increasing heart efficiency, lung capacity, and endurance. However, if this person never incorporates strength training, they might lose muscle mass over time. Conversely, if they only lift weights twice a week but never do cardio, their heart and lungs may not be as fit. Both types complement each other for balanced health.

How do strength training and cardio work together to improve your health?

When combined, strength training and cardio provide more comprehensive health benefits than either alone. Strength training works primarily through anaerobic pathways, building muscle strength and power by pushing muscles beyond their usual limits. When muscles repair after these workouts, they grow stronger and more resilient. This process also boosts resting metabolic rate, meaning you burn more calories even at rest.

Cardio, meanwhile, uses aerobic pathways to improve the efficiency of the cardiovascular and respiratory systems. Regular cardio exercise lowers blood pressure, improves cholesterol levels, and increases the body’s ability to use oxygen efficiently. This reduces the risk of heart disease, stroke, and type 2 diabetes.

For example, if a person runs or cycles for 30 minutes at a moderate pace three times a week and also does two strength training sessions focused on all major muscle groups, they experience improved heart health and muscle tone simultaneously. The cardio workouts enhance endurance and calorie burn, while strength training supports muscle maintenance and bone health.

Together, these exercises improve overall energy levels, functional strength for daily activities, and mental well-being by reducing stress and enhancing mood. People often find that this balanced approach leads to better long-term adherence because they enjoy varied workouts.

Why does the balance between strength training and cardio matter for adults?

As adults age, maintaining a balance between strength training and cardio becomes increasingly important. Muscle mass naturally declines after the mid-20s, a process called sarcopenia, which can lead to weakness, reduced mobility, and greater injury risk. Strength training helps counteract this loss by stimulating muscle growth and maintaining bone density, which decreases osteoporosis risk.

Meanwhile, cardio exercise supports heart and lung health, which also tends to decline with age. Without cardio, the risk of cardiovascular diseases increases, and endurance for everyday activities like walking or climbing stairs can suffer.

For example, a 45-year-old who only does cardio may have good endurance but weaker muscles and joints, increasing injury risk. Another person who only lifts weights might have strong muscles but poor cardiovascular fitness, resulting in fatigue during prolonged activities.

Balancing both types helps maintain independence, reduces chronic disease risk, and supports a healthy metabolism. Additionally, combining strength training and cardio can improve balance and coordination, which helps prevent falls, a major concern for older adults.

Adults wanting to maintain general fitness should aim for at least 150 minutes of moderate cardio weekly plus two or more strength training sessions. This balance optimizes benefits for heart health, muscle strength, energy, and overall quality of life.

What common terms related to exercise do people confuse with strength training or cardio?

Understanding the different types of physical activity terms can help you plan better workouts. People often confuse strength training with flexibility or mobility exercises. Stretching or yoga, for example, improve joint range of motion and muscle elasticity but don’t significantly increase muscle strength or cardiovascular fitness.

Another confusion occurs between aerobic and anaerobic exercise. Cardio is typically aerobic, involving sustained moderate effort that uses oxygen for energy. Anaerobic exercise, such as sprinting or heavy lifting, involves short bursts of intense effort without relying on oxygen immediately.

High-intensity interval training (HIIT) blends cardio and strength by alternating brief intense activity bursts with recovery periods. While efficient, HIIT is not a full substitute for dedicated strength and cardio sessions because it often prioritizes one or the other depending on the workout design.

Also, people sometimes mistake circuit training for pure cardio or strength training. Circuit training involves a series of strength exercises performed back-to-back with minimal rest, which elevates heart rate and builds endurance, combining aspects of both.

Knowing these distinctions helps you choose exercises that align with your goals and avoid confusion when following fitness advice.

How much strength training and cardio should a typical adult do each week?

Most health organizations recommend adults engage in a combination of cardio and strength training weekly for optimal health. The general guideline is:

• Cardio: At least 150 minutes of moderate-intensity aerobic exercise per week (e.g., brisk walking, cycling), or 75 minutes of vigorous-intensity aerobic exercise (e.g., running, swimming laps).

• Strength Training: Two or more non-consecutive days per week focusing on all major muscle groups (legs, hips, back, abdomen, chest, shoulders, arms).

You can break cardio into sessions lasting 10 minutes or more throughout the week. Strength training sessions vary from 20 to 60 minutes depending on experience and workout complexity.

Here’s a sample balanced weekly workout plan:

This plan offers variety, rest, and targets both fitness components. Adjust based on personal preferences, fitness level, and goals.

What adjustments should you make if your goal is weight loss or muscle gain?

The balance between strength training and cardio can shift depending on whether your primary goal is to lose weight or build muscle.

For Weight Loss:

A combination of cardio and strength training works best. Cardio burns calories during exercise, and strength training builds muscle, which increases resting metabolic rate — the calories your body burns at rest. For example, if you aim to lose weight, you might do 4 cardio sessions a week totaling 150 to 200 minutes, plus 2 to 3 strength training sessions. Including strength training helps avoid muscle loss that often accompanies weight loss.

For Muscle Gain:

Focus more on strength training with heavier weights or resistance and fewer cardio sessions to avoid interfering with muscle recovery. For instance, you could do 3 to 5 strength training sessions weekly, targeting different muscle groups each day, and limit cardio to 1 or 2 low-impact sessions like walking or swimming to maintain heart health without burning too many calories. Ample protein intake and rest are also important.

For both goals, consistency and gradual progression in intensity and duration are key. Tracking your workouts and nutrition helps tailor the plan effectively.

How can you start creating a balanced workout plan that includes strength training and cardio?

Beginning a balanced fitness routine can feel overwhelming, but breaking it down into clear steps helps:

1. Define Your Goals: Are you focusing on general health, weight loss, muscle building, or endurance? Write these down to shape your plan.

1. Schedule Cardio: Choose cardio activities you enjoy, like walking, cycling, swimming, or dance. Start with 20 to 30 minutes per session, three to five times a week.

1. Add Strength Training: Begin with two sessions per week working all major muscle groups. Bodyweight exercises like squats, push-ups, and lunges are good starting points. Gradually add weights or resistance bands.

1. Focus on Technique: Proper form reduces injury risk. Consider watching instructional videos or meeting with a fitness trainer for guidance.

1. Allow Recovery: Rest days help muscles repair and prevent burnout. Plan at least one to two rest or active recovery days weekly.

1. Track Progress: Keep a workout log noting exercises, reps, sets, and cardio duration. Adjust intensity or volume as you improve.

1. Combine with Nutrition: Support workouts with balanced meals rich in protein, healthy fats, and carbohydrates. Hydrate well.

Before starting, check with your healthcare provider if you have existing health issues or concerns. This step ensures your exercise plan is safe and effective.

Frequently asked questions

Can I do strength training and cardio on the same day?

Yes, combining both in the same day is common and effective. Many people do cardio either before or after strength training. If your priority is building muscle, do strength training first to maximize energy. For endurance, cardio first may be preferable. Always listen to your body and allow time for recovery.

How long should each strength training session last?

Sessions typically range from 20 to 60 minutes depending on your fitness level and goals. Beginners can start with shorter sessions focusing on basic exercises and gradually increase duration and intensity as strength improves.

Is walking considered cardio exercise?

Yes, brisk walking qualifies as moderate-intensity cardio and offers cardiovascular benefits. To gain these benefits, aim for a pace that raises your heart rate and breathing while still allowing you to talk comfortably.

How soon can I expect results from combining strength training and cardio?

Most people notice improvements in strength, endurance, and energy within 4 to 8 weeks with consistent effort. Visible changes like muscle tone and weight loss may take longer, depending on diet and workout intensity.

Is strength training safe for older adults?

Absolutely. Strength training is especially beneficial for older adults to maintain muscle mass, bone density, and balance. Starting with light weights or bodyweight exercises and proper instruction reduces injury risk.

What if I only have 30 minutes a day to exercise?

Focus on high-quality workouts, such as a combination of 20 minutes of cardio and 10 minutes of strength training or circuit-style training that mixes both. Consistency matters more than duration.