When summer is around the corner, the question almost everyone starts asking is: Should I be doing cardio or strength training to get in shape? It is one of the most common fitness debates out there, and the honest answer is that both have a role to play. Understanding what each one does for your body helps you train smarter, not just harder, and actually enjoy the process of working toward your summer body.

Whether you are just getting started or looking to fine-tune your approach, this guide breaks down the real differences between cardio and strength training, how they work together, and what you can realistically expect. No hype, no quick-fix promises—just useful, straightforward information to help you move forward with confidence.

What is the difference between cardio and strength training?

Cardio and strength training are two distinct types of exercise that challenge your body in different ways. Cardio, short for cardiovascular exercise, raises your heart rate and trains your heart and lungs to work more efficiently. Strength training, also called resistance training, uses load or resistance to build and maintain muscle tissue. Both improve your health, but through different mechanisms.

Cardio includes activities like running, cycling, swimming, or rowing. Your body primarily uses oxygen to fuel these sessions, which is why they tend to feel more breathless and endurance-focused. Strength training, on the other hand, includes lifting weights, using resistance machines, or doing bodyweight exercises like squats and push-ups. Here, your muscles are challenged to contract against resistance, which over time makes them stronger and more defined.

The key distinction is this: Cardio trains your cardiovascular system and burns energy during the session, while strength training builds muscle and raises your resting metabolism over time. Both are valuable, and both contribute to a well-rounded fitness routine.

Which is better for losing fat before summer?

For fat loss, strength training has a meaningful edge over cardio alone. Building muscle increases your resting metabolic rate, meaning your body burns more energy throughout the day, not just during exercise. That said, cardio supports fat loss by creating an additional calorie burn and improving your cardiovascular health. The most effective approach combines both.

A common misconception is that more cardio automatically means more fat loss. In reality, if you only do cardio without strength training, you risk losing muscle alongside fat, which can leave you feeling softer and less energized rather than lean and strong. Strength training preserves and builds the muscle that gives your body shape and tone.

Nutrition plays a big role here, too. No amount of training—cardio or otherwise—will deliver lasting fat-loss results without a diet that supports your goals. That means eating enough protein, managing your portions, and fueling your body well, not starving it.

Does strength training make you bulky or lean?

Strength training does not make you bulky. For most people, regular strength training leads to a leaner, more defined physique. Building significant muscle mass requires very specific conditions, including a sustained calorie surplus, a high training volume, and often years of consistent work. For the average person training a few times per week, strength training creates shape and definition, not bulk.

This is a concern we hear often, particularly from women who worry about looking too muscular. The reality is that women have lower levels of testosterone than men, which makes building large amounts of muscle much harder. What strength training does do is help you look and feel stronger, improve your posture, and give your body more visible structure.

If your goal is a lean summer body, strength training is one of your best tools. It builds the muscle that makes your body look defined, and it keeps your metabolism working in your favor long after your workout is done.

How do cardio and strength training work together for a summer body?

Cardio and strength training work best as a team. Strength training builds the muscle and structure that shapes your body, while cardio supports your heart health, boosts your energy levels, and contributes to your overall calorie balance. Together, they create a training routine that is both effective and sustainable for a summer body goal.

A well-rounded weekly routine might include two to four strength sessions and one to three cardio sessions, depending on your goals, fitness level, and schedule. The exact balance depends on what you are working toward. Someone focused primarily on fat loss might include more cardio, while someone building strength and definition might lean more heavily into resistance training.

What matters most is consistency. A plan that combines both types of training, and that you can actually stick to, will always outperform an extreme routine that burns you out after two weeks. Progress comes from showing up regularly, not from going all-in for a short burst.

Should you do cardio or weights first in a workout?

If your goal is building strength or muscle, do weights first. Your muscles perform best when they are fresh, and starting with cardio can fatigue them before you even pick up a weight. If your primary goal is cardiovascular endurance, start with cardio. For most people working toward a summer body, strength training first is the better choice.

There is some flexibility here. A short warm-up jog or five minutes on a bike before lifting is perfectly fine and actually helpful for getting your body ready to move. The concern is doing a long, intense cardio session before your strength work, which can compromise your form, reduce your strength output, and increase your injury risk.

If you prefer to keep cardio and strength training on separate days entirely, that works well, too. Splitting them gives each session its own focus and allows your body to recover more effectively between sessions.

How quickly can you see results with the right training approach?

With a consistent and well-structured training approach, most people start noticing real changes within four to eight weeks. Early wins often include improved energy, better sleep, feeling stronger in your sessions, and clothes fitting differently. Visible changes in body composition typically follow after about six to twelve weeks of consistent effort.

Results depend on several factors: how consistently you train, how well you eat, how well you sleep, and how your body responds to exercise. There is no universal timeline, and comparing your progress to someone else’s is rarely useful or fair. What matters is that you are moving in the right direction.

One thing worth noting is that the changes you feel often come before the changes you see. Improved energy, better mood, stronger workouts, and a clearer head are all signs that your body is responding. Those internal shifts are worth celebrating just as much as any visible result.

How B-One Training helps you build your summer body

At B-One Training, we take the guesswork out of the cardio versus strength debate entirely. Our coaches design a personalized program that combines both in the right balance for your specific goals, fitness level, and lifestyle. You do not have to figure it out alone.

Here is what working with us looks like in practice:

A full lifestyle intake to understand your goals, schedule, and starting point
A tailored training program that balances strength and cardio based on what you actually need
Clear nutrition guidance, covering portions, meal timing, and food choices that support fat loss and muscle development
Regular check-ins to track your progress and adjust the plan as you improve
One-on-one coaching in a private, judgment-free studio at one of our three Amsterdam locations: Jordaan, Oud-Zuid, or Centrum
Support that goes beyond workouts, including guidance on sleep, stress, and recovery

Every program we build is rooted in what actually works for your body and your life—not a generic template. Explore our training programs to find the right fit for your goals, or get in touch with us and let us help you get started.

What is the difference between cardio and strength training for a summer body?