What Is Cardio Exercise?
When people say “cardio,” they’re talking about cardiovascular exercise—any activity that raises your heart rate and gets you breathing faster. Think running, biking, swimming, jumping rope, or even brisk walking.
These exercises primarily aim to strengthen your heart and lungs, improve your endurance, and help burn calories. Cardio is often associated with fat loss and boosting your overall fitness levels. It’s the kind of movement that gets your blood pumping and can leave you sweaty and out of breath in a good way.
What Is Working Out?
Now, when people say, “working out,” it can mean different things depending on who you ask. But generally, in this context, it refers to resistance or strength training—things like lifting weights, doing bodyweight exercises (like push-ups or squats), or using resistance bands.
This kind of workout is focused on building muscle, increasing strength, improving bone density, and enhancing muscular endurance. It’s the kind of training where you’re challenging your muscles through tension and resistance.
So, cardio is all about your heart and lungs, while strength training (or “working out” in this sense) is about your muscles and physical power.
SHOULD YOU DO CARDIO BEFORE OR AFTER WORKING OUT?
The answer isn’t one-size-fits-all. It really depends on your goals, your fitness level, and how you want to feel during and after your workout. Let’s go over a few common goals and see how the timing of your cardio fits in with them.
IF YOUR GOAL IS TO BUILD MUSCLE OR GAIN STRENGTH:
You’ll probably want to do cardio after strength training.
Here’s why: strength training requires a lot of energy, focus, and effort—especially if you’re lifting heavy or doing complex movements like squats, deadlifts, or bench presses.
If you use up your energy doing cardio first, your muscles might already be fatigued by the time you get to the weights, which could make your strength workout less effective.
By saving cardio for after, you can go into your strength training fresh, give it your all, and then burn some extra calories or cool down with some moderate cardio at the end.
IF YOUR GOAL IS TO IMPROVE ENDURANCE OR CARDIOVASCULAR HEALTH:
Then it makes sense to do cardio before your strength workout, or even to focus on cardio as your primary workout.
Let’s say you’re training for a race, working on your stamina, or just want a healthier heart and lungs—then cardio should come first while you’re still energized. You can still do strength training afterward, but it becomes more of a secondary goal in the workout session.
IF YOUR GOAL IS WEIGHT LOSS OR GENERAL FITNESS:
This is where it gets more flexible.
Some trainers recommend doing strength training first, then finishing with cardio—especially because lifting weights can elevate your heart rate and metabolism, and then cardio helps you burn extra calories after your muscles are already taxed. Others say it doesn’t matter as much, as long as you’re consistent with both.
What’s most important here is how you feel. If doing cardio first leaves you dragging for your weight training, flip the order. If you like getting warmed up with a light jog before lifting, and it helps you feel looser, that’s fine too.
HOW ABOUT DOING BOTH TOGETHER?
You can also do them on separate days. For example, strength training three days a week and cardio on the other days. That way, you give each workout type your full energy and attention.
Another method is something like circuit training or high-intensity interval training (HIIT), where you blend cardio and strength movements in the same session. That works really well for people looking for efficiency, calorie burn, and overall conditioning.
A FEW OTHER THINGS TO THINK ABOUT:
Warm-Up Matters: No matter what order you choose, always warm up. Even if you’re doing strength first, a quick 5-10 minutes of light cardio (like walking or cycling) can get your body ready and help prevent injuries.
Recovery Is Key: Doing intense cardio and weight training in the same session every day can wear you down. Make sure you’re getting enough rest and fueling your body properly.
SO, SHOULD YOU DO CARDIO BEFORE OR AFTER WORKING OUT?
It depends on what you’re trying to achieve:
Muscle and strength? Cardio after.
Endurance and heart health? Cardio before.
Weight loss or general health? Go with what helps you stay consistent and feel good.
If you’re looking to make the most of your workouts—whether you’re doing cardio before, after, or on separate days—there are a few additional things that are really helpful to understand. These go beyond just the order of cardio and strength training and get into how to train smarter and stay on track.
YOUR BODY HAS LIMITED ENERGY IN A SESSION
You only have so much energy, especially in a single workout. If you push too hard on cardio and then try to lift heavy weights, or vice versa, your performance in the second part of your workout will suffer. That’s not necessarily a bad thing, but it’s important to be mindful of how you pace yourself depending on what you want to get out of your training.
DOING TOO MUCH CARDIO CAN INTERFERE WITH MUSCLE GAINS
This is called the “interference effect.” If you’re doing a ton of long, steady-state cardio (like an hour on the treadmill every day), it may blunt your strength and muscle-building progress—especially if you’re not eating enough protein or getting proper rest. If gaining muscle is your goal, cardio should be moderate and supportive, not the main event.
NUTRITION PLAYS A BIG ROLE IN ALL OF THIS
If you’re doing both cardio and strength training, your body needs fuel. That means:
Carbs for energy (especially before cardio or lifting)
Protein to build and repair muscle
Water to stay hydrated during and after workouts
Not eating enough or not eating the right balance can leave you tired, sore longer, and more likely to burn out.
RECOVERY IS JUST AS IMPORTANT AS TRAINING
If you’re hitting the gym hard with both cardio and weight training, you need to prioritize recovery:
Sleep (7–9 hours is ideal for most people)
Rest days (don’t underestimate their value)
Stretching or mobility work to prevent stiffness and injury
Without recovery, your body doesn’t get stronger—it just gets tired.
MIXING IT UP PREVENTS BURNOUT
Some people start strong and go all-in with back-to-back cardio and weight sessions, but burn out quickly. Mixing things up throughout the week—doing short cardio sessions, heavier lifting days, lighter mobility days—keeps things fresh and more sustainable long term.
YOU CAN ALWAYS ADJUST BASED ON HOW YOU FEEL
Some days you’re more energetic, others you’re drained. It’s okay to shift the order of your workout depending on how you feel. Flexibility in training often leads to better consistency. If your legs feel trashed from squats, maybe swap that long run for a lighter bike ride or rest.
YOU DON’T HAVE TO GO TO EXTREMES
You’ll hear people say you need to do an hour of cardio or lift until failure—but really, moderate, consistent training is more effective over time than pushing to extremes. A well-balanced 45-minute session that includes a short warm-up, strength work, and a bit of cardio can be more effective than a two-hour gym marathon.
WHAT YOU ENJOY MATTERS
You’re more likely to stick with a routine if you enjoy at least parts of it. Hate running? Try swimming, cycling, hiking, rowing, or even dance-based cardio. Don’t like the bench press? Try dumbbells or bodyweight training. You’re building a lifestyle, not just checking boxes.
MANY PEOPLE DO BOTH CARDIO AND STRENGTH TRAINING ON THE SAME DAY
This is especially true for people who:
Have limited days to train during the week
Are aiming for overall fitness or weight loss
Want to be efficient with their workouts
Doing both in one session (or split between morning and evening) helps them cover all their bases—build strength, improve cardiovascular health, and burn calories.
Typical structure:
Strength first, then cardio: quite common for those focused on muscle gain or fat loss
Cardio first, then strength: more common in endurance athletes or people warming up with light cardio
PROS:
Efficient use of time
Keeps the workout schedule simpler (fewer days needed)
Boosts calorie burn in a single session
CONS:
It can be tiring, especially if one part is intense
You may not be at 100% for the second part of your workout
It requires longer gym sessions unless you split them up by time of day
SOME PEOPLE SPLIT IT UP—CARDIO ON SOME DAYS, STRENGTH ON OTHERS
This is often done by people who:
Train 5–6 days a week
Like to focus on one type of training at a time
Are athletes with a specific plan or training cycle
Want more recovery between heavy strength days
TYPICAL SPLIT:
3 days strength training (e.g., Mon/Wed/Fri)
2–3 days cardio (e.g., Tue/Thu/Sat)
Or a variation like:
M: Strength
T: Cardio
W: Strength
Th: Cardio or Rest
F: Strength
Sa/Su: Optional cardio or rest
PROS:
You can focus more deeply on one goal per day
Less fatigue within a single session
Good recovery balance if programmed smartly
CONS:
Requires more days in your weekly schedule
May feel like you’re in the gym or exercising all the time
Some people may struggle to stay consistent with a 5–6 day routine
WHAT ABOUT BEGINNERS OR BUSY PEOPLE?
For people who are just starting out or have limited time, doing shorter, combined workouts (20–40 minutes of strength plus 10–20 minutes of cardio) a few days a week often works best. It builds a strong foundation without overwhelming them or taking up too much of their day.
Yes, many people do both in one day—especially if they’re short on time or want a full-body workout.
Others spread cardio and strength across the week, which allows for more focus, better recovery, and more manageable sessions.
Neither is “better”—it’s about what fits your goals, energy levels, and schedule.
Figuring out whether you should do cardio and strength on the same day or on separate days depends on a few key factors about you—your goals, time, energy levels, lifestyle, and even personality.
LET’S WALK THROUGH THE MAIN POINTS TO HELP YOU CHOOSE THE RIGHT APPROACH FOR YOUR SITUATION.
WHAT ARE YOUR PRIMARY FITNESS GOALS?
This is the biggest factor.
IF YOUR MAIN GOAL IS TO BUILD MUSCLE OR GET STRONGER:
Prioritize strength training.
Do cardio after your strength sessions, or on separate days to avoid interfering with recovery.
Example: Lift weights 3x per week, light/moderate cardio on off days.
IF YOUR MAIN GOAL IS TO IMPROVE ENDURANCE OR HEART HEALTH:
Prioritize cardio (running, cycling, swimming, etc.).
Strength training can be shorter and done after cardio or on separate days.
Example: Cardio 3–5x per week, light strength work 2x per week.
IF YOUR GOAL IS WEIGHT LOSS OR GENERAL FITNESS:
A mix of both works well.
You can do both in one day (strength then cardio), or alternate days based on your schedule.
Flexibility is key here.
HOW MUCH TIME DO YOU HAVE EACH DAY?
Limited time (30–60 min)?
Do both in one session—20–30 min strength, followed by 15–25 min cardio.
Plenty of time during the week, but shorter chunks per day?
Alternate strength and cardio on different days.
Longer workout windows a few times a week?
You could double up—just be mindful of fatigue.
HOW DO YOU FEEL AFTER EACH TYPE OF WORKOUT?
If cardio exhausts you and hurts your strength performance, strength should come first or be done on a separate day.
If you use cardio as a warm-up and it energizes you, doing it first might work.
Pay attention to how your body responds over a few weeks and adjust accordingly.
WHAT’S YOUR RECOVERY LIKE?
If you’re often sore, tired, or not sleeping well, doing every day may be too much.
Consider alternating days or reducing the intensity of one type.
Tip: If you’re over 35 or newer to training, recovery becomes even more important.
WHAT SCHEDULE CAN YOU STICK WITH CONSISTENTLY?
The best program is the one you’ll actually do.
Hate long sessions? Go shorter but more frequent.
Like full, intense workouts? Combine cardio and strength.
Only 3 days a week to train? Combine both in one session.
ARE YOU TRAINING FOR SOMETHING SPECIFIC?
If you’re training for a race, competition, or event:
Your training should be goal-specific.
For example, if training for a 5K, your running plan comes first; strength supports it.
If doing a fitness competition or powerlifting meet, strength comes first.
HERE ARE SOME OTHER IMPORTANT THINGS TO KEEP IN MIND WHEN COMBINING CARDIO AND STRENGTH TRAINING, OR WHEN BUILDING YOUR OVERALL ROUTINE.
You Don’t Have to Go All-Out Every Time
One of the biggest mistakes people make is thinking every workout needs to be intense. The truth is, not every session has to leave you wiped out. Some days, just showing up, moving your body, and staying consistent is the win.
You might do a heavy strength day Monday
Follow with an easy cardio day Tuesday
Then a moderate full-body strength/cardio mix Wednesday
This kind of variety helps your body and your motivation.
Pay Attention to Workout Order Within the Session
If you do both cardio and strength in the same workout:
Do the most important part of your workout first when you’re freshest
If your goal is strength, lift first
If your goal is endurance, do cardio first
If weight loss or general fitness is your aim, it doesn’t matter as much—just keep intensity and fatigue in mind
Your Heart Rate Tells a Story
Whether doing cardio or strength, tracking your heart rate can help you stay in the right zone:
Low to moderate heart rate (Zone 2): Great for fat burning and endurance
Higher zones: Used in interval training, sprints, or heavy strength sets
Over time, you’ll notice your heart rate will return to normal faster after exercise—that’s a sign of improving fitness.
Rest Between Strength Sets Matters
If you’re trying to:
Build strength: Rest 1.5 to 3 minutes between sets
Build muscle (hypertrophy): Rest 30–90 seconds
Burn calories/keep heart rate up: Keep rest minimal and maybe mix in short bursts of cardio between sets (like jump rope, mountain climbers, etc.)
How you rest changes how your body responds.
Nutrition Can Make or Break Your Progress
We touched on this earlier, but it’s worth repeating:
Pre-workout: Eat something with carbs and protein 30–90 minutes before (like a banana with peanut butter or Greek yogurt with fruit)
Post-workout: Have protein and carbs to help your muscles recover and replenish energy (like a protein shake and a slice of whole grain toast, or chicken and rice)
Also, hydration really matters—especially on days when you’re doing both cardio and strength.
Don’t Skip Sleep or Recovery Days
Exercise is just the stimulus. Your body gets stronger and leaner during rest and recovery. If you don’t sleep enough, overtrain, or skip rest days:
You may stop seeing progress
You risk injury or burnout
Your motivation can take a hit
Quality sleep (7–9 hours), good hydration, mobility work, and occasional stretching or foam rolling all help.
Listen to Your Body—It Will Tell You What You Need
Sometimes, what your plan says and what your body feels won’t line up. If your body feels heavy, your joints ache, or your energy crashes mid-week:
Don’t be afraid to swap cardio for walking
Lighten the weight
Take an active recovery day (like yoga or a gentle bike ride)
Consistency over time matters more than one killer workout.
ENJOY THE PROCESS
Finally, remember why you’re doing this. Whether it’s better health, more energy, strength, confidence, or just feeling good in your skin—you’re building a lifestyle, not chasing a quick fix. The more you enjoy your workouts, or at least parts of them, the more likely you are to keep going.
In the end, whether you do cardio before or after your strength training—or on a completely different day—comes down to understanding your body, your goals, and your lifestyle.
There’s no universal rule that fits everyone. What works for a bodybuilder trying to gain muscle mass will be quite different from what works for someone training for a marathon, or for someone simply trying to lose a few pounds and feel better day to day.
The key is being honest with yourself about what you’re working toward and setting up your workouts to support that goal, not undermine it.
Consistency will always matter more than perfection. Whether you’re mixing cardio and weights into a single session or spreading them across different days, showing up regularly and putting in thoughtful effort is what drives results.
And if something isn’t working—if you’re feeling overly tired, stuck in a plateau, or just not enjoying your workouts—it’s okay to shift gears. Fitness is a lifelong journey, not a fixed destination.
Finally, don’t underestimate the importance of enjoyment and sustainability. The best workout routine is one you can stick with. Whether that means keeping things short and efficient or exploring different combinations of cardio and strength, your plan should work for you, not against you. Stay flexible, stay curious, and remember: movement is a gift. Use it well.
TO DIVE DEEPER INTO EVERYTHING WE TALKED ABOUT—CARDIO, STRENGTH TRAINING, WORKOUT PLANNING, RECOVERY, AND HOW TO COMBINE THEM—YOU CAN FIND RELIABLE AND WELL-ROUNDED INFORMATION IN A FEW KEY PLACES:
Reputable Fitness and Health Websites
These sites often provide science-backed advice and beginner-to-advanced training programs:
ACE (American Council on Exercise) – acefitness.org
Offers detailed guidance on cardio, strength training, and how to structure workouts based on your goals.
NASM (National Academy of Sports Medicine) – nasm.org
Great for understanding training principles, rest, nutrition, and how cardio and weight training complement each other.
Mayo Clinic – Fitness Section – mayoclinic.org/healthy-lifestyle/fitness
Useful for health-based overviews of different types of exercise, heart health, and long-term wellness.
Examine.com – examine.com
A reliable source if you’re curious about supplements, exercise science, or how training affects the body biologically.
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YouTube Channels (Evidence-Based Trainers & Coaches)
Just be cautious—stick with credible voices, not flashy fads.
Jeff Nippard – Offers science-based training tips and explains the cardio vs. weights debate well.
Athlean-X – Run by a physical therapist and strength coach who focuses on safe and effective training.
FitnessBlender – Great for home workouts that combine cardio and strength in realistic, accessible ways.
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Books
“Bigger Leaner Stronger” by Michael Matthews – Great for understanding how to balance cardio and weights for strength or fat loss.
“The New Rules of Lifting” by Lou Schuler and Alwyn Cosgrove – Covers exercise programming for real people, not just athletes.
“Spark” by John J. Ratey – Explores how cardio and movement affect your brain, mental health, and motivation.
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Certified Personal Trainers or Coaches
If you want personalized advice or help designing your plan, consider meeting with a certified trainer at a gym or online. Many offer consultations, and some will help you create a hybrid plan combining cardio and strength.