Nobody tells you the treadmill can lie to you. I found out the hard way.
Three years ago, I was doing 45 minutes on the elliptical every single morning. Six days a week, without fail. I was sweating through my shirt, burning somewhere around 400 to 500 calories according to the machine, and feeling genuinely proud of myself. After two months of this, I had lost maybe two pounds. My clothes fit exactly the same. My arms looked the same. I was exhausted, honestly a little demoralized, and completely confused about what I was doing wrong.
That’s when a gym buddy of mine who had dropped 18 kilos in about eight months sat me down and said, “Bro, you’re cardio-ing yourself into a plateau.” I didn’t believe him at first. Cardio burns calories, right? More calories burned equals more weight lost. That’s just math. Except it isn’t. Or at least, it’s not the whole equation. So I spent the next six months actually experimenting first leaning heavy into strength training, then combining it with cardio, tracking everything on my Garmin Forerunner 255 and logging food with MyFitnessPal. Here’s what I learned the real stuff, not the gym-poster version.
Why Cardio Alone Kept Failing Me
Here’s the thing nobody explains clearly: your body is incredibly good at adapting. When you do the same cardio routine day after day, your body gets efficient at it. It literally starts burning fewer calories to complete the same workout. Scientists call it metabolic adaptation. I call it deeply annoying.
On top of that, long steady state cardio think jogging at a medium pace for 45 minutes or more can seriously increase your hunger hormones. I noticed this myself. After a long run, I was absolutely ravenous. I’d easily eat back 80% of what I’d burned without even realizing it. A bowl of oats here, a banana there, an “I deserve this” protein bar after the gym. It adds up fast. The treadmill said I burned 480 calories. My food tracker showed I ate 420 extra that day because I was so hungry. The math was actively working against me, and I had no idea.
This doesn’t mean cardio is bad or useless far from it. It’s great for your heart, your lungs, your mental health, and your endurance. But relying on it as your primary weight-loss strategy, especially without paying close attention to what you eat afterward? That’s where I was going wrong, and where a lot of people get stuck.
What Happened When I Switched to Strength Training
My first month of lifting was humbling, honestly. I was using weights that felt embarrassingly light. My form was rough and I watched a lot of YouTube videos Alan Thrall and Jeff Nippard were basically my coaches for those early weeks. I didn’t feel like I was “working out” the way I used to because I wasn’t drenched in sweat the way the elliptical used to leave me. Part of me kept thinking I wasn’t doing enough.
But then, around week five, something clicked. My shirts started fitting differently across the shoulders. My waist looked slightly smaller even though the scale had barely moved. And based on weeks of data from my Garmin which estimates your resting calorie burn over time it seemed like my baseline metabolism was climbing. Here’s why that happens: muscle tissue burns more calories at rest than fat tissue does. When you build even a modest amount of muscle, your body becomes a slightly more efficient calorie burning machine around the clock, not just when you’re in the gym. This is the afterburn effect people talk about, and it’s real even if it’s not as dramatic as some YouTube thumbnails would have you believe.
Strength training also elevated my metabolism for up to 38 hours after each session through something called EPOC excess post exercise oxygen consumption. My body was essentially still “paying off” the workout the next morning while I was just sitting at my desk drinking coffee. That’s something a steady jog doesn’t really give you at the same level.
An Honest Look at Both Approaches
Cardio genuinely does burn more calories during the actual session. If you go for a 40 minute run, you’ll burn more in those 40 minutes than you would doing 40 minutes of weight training. The mood boost from it is also real there’s a reason people call it a runner’s high. It’s accessible too. You don’t need equipment; you can just walk out your front door. For heart health and general endurance, cardio is hard to beat.
But strength training changes your body composition in a way that cardio simply doesn’t. You can lose weight from cardio alone and end up “skinny fat” lighter on the scale, but still soft and undefined because you’ve lost muscle along with fat. With strength training, even when the scale isn’t moving much, your shape is changing. Your body is trading fat for muscle, and that process takes time to show up as a number but shows up very clearly in how your clothes fit and how you look in photos. The calorie burn also stretches well beyond the workout itself, which matters a lot over weeks and months.
The Approach That Actually Worked
After months of experimenting, I landed on a hybrid approach, and it’s where I stayed because it’s the first thing that produced consistent, visible results. I did upper body strength on Monday, a short HIIT cardio session on Tuesday 20 minutes of sprint intervals, nothing fancy lower body strength on Wednesday, an active rest day Thursday with a brisk walk or some light yoga, full body strength on Friday, a longer steady state jog or bike ride on Saturday, and a complete rest day on Sunday. That last part is important. Rest is not optional. It’s when your muscles actually repair and grow.
The key shift was replacing long daily cardio with shorter, more intense cardio sessions and adding three solid strength days per week. I tracked my lifts with the Strong app and switched from MyFitnessPal to Cronometer for food because it gives better micronutrient and macro breakdowns. Both free, both genuinely useful if you’re serious about understanding what you’re eating.
Mistakes I Made — And See Other People Make All the Time
The biggest mistake I made early on was trusting the calorie numbers on cardio machines. Treadmills and ellipticals overestimate calories burned by anywhere from 15 to 40 percent. I was eating back imaginary calories for months. Switching to a chest strap heart rate monitor I use a Polar H10 gave me data I could actually trust.
The second mistake, which I see constantly especially among women, is avoiding strength training out of fear of “bulking up.” Building significant muscle mass requires years of dedicated effort and usually a caloric surplus on top of that. A few strength sessions a week will not make you bulky. It will make you leaner, more defined, and stronger in a way that cardio never could.
I also spent three weeks nearly quitting because the scale wasn’t moving after I started lifting. What I didn’t realize was that my measurements were actually changing. My jeans were fitting better. I was almost undone by a number on a scale while real progress was happening right in front of me. This is why tracking body measurements and taking progress photos matters so much more than daily weigh-ins.
Fasted cardio doing cardio on an empty stomach because you think it burns more fat was another thing I tried and abandoned quickly. The research on it is genuinely mixed, and my personal experience was worse workouts, more muscle breakdown, and feeling awful all morning. Most people are better off having a small amount of food before training and just working harder.
And finally, the protein thing. This one is huge and most people underdo it. If you’re strength training, you need roughly 1.6 to 2.2 grams of protein per kilogram of bodyweight to preserve and build muscle while losing fat. When I started, I was eating about half that. No wonder the results were slow.
What About HIIT?
HIIT High Intensity Interval Training is genuinely one of the best tools available if you enjoy cardio but hate spending an hour on a machine. Short bursts of maximum effort followed by rest periods. You burn a solid amount of calories during the session and get a meaningful afterburn effect afterward. It’s efficient. A 20 minute proper HIIT session beats 45 minutes of low intensity jogging for most weight loss goals.
The catch is that it’s actually hard, and most people aren’t going hard enough during the work intervals to get the full benefit. If you can hold a conversation during your sprint intervals, you’re not sprinting. And doing HIIT every day is a fast track to burnout and joint problems. Two to three sessions a week is the sweet spot for most people.
So Which One Should You Actually Do?
If you could only pick one, pick strength training. Especially if you’re over 30, have been doing cardio for months without meaningful results, or find that you’re losing weight but still feeling soft and undefined. Strength training preserves your muscle while you lose fat, and that’s what gives you the body composition most people are actually after.
But you don’t have to pick just one, and you probably shouldn’t. The best results I’ve seen in myself and in the people I’ve trained alongside over the years come from combining both. Three days of strength, two days of cardio, and real rest. The goal isn’t to burn the most calories today. It’s to build a body that burns more calories every single day, including the days you’re sitting still.
Track your measurements alongside your weight. Use a fitness tracker if it keeps you consistent Garmin, Polar, Fitbit, whatever works for you. Log your workouts so you can see your lifts progressing even when the scale is stubborn, because that progress is real and it matters. And give yourself at least three honest months before you judge whether something is working. Take photos at the start. You’ll be genuinely glad you did.
Minhas is the founder and editor of InsidersDesk, a health and wellness platform dedicated to providing practical, easy-to-understand information on fitness, nutrition, healthy living, and mental well-being. He researches trusted sources and transforms complex health topics into actionable advice that readers can apply in their daily lives. His goal is to help individuals build healthier habits and make informed decisions about their overall wellness.
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