10 Fitness Myths and the Truth Behind Them

We've all been there—starting a fitness journey with enthusiasm, only to find ourselves frustrated by slow progress or setbacks. Fitness coachMark Lewis knows this journey intimately. Once overweight in his thirties, he transformed himself into a competitive athlete approaching 50. Recently, he shared the crucial mistakes that slowed his progress—and how you can avoid them to fast-track your own transformation.

Don't Let Setbacks Spiral into Disasters

"Life is complicated. Things happen," says Mark in his post. He learned this lesson the hard way after multiple fitness setbacks. One vacation in 2015 turned into a prolonged backslide when he let a brief training break snowball into a complete abandonment of his healthy habits.

"I'd think, 'Oh my God, it's all falling apart,' and panic my way into a double cheeseburger, over and over again," he admits. The key is treating setbacks as temporary pauses, not permanent defeats.

"Unless you're an elite athlete operating at 11 the whole time, such things will stop you moving forward, but that's about all," Mark explains. His advice? "Relax, let the holiday happen, eat the donut, recuperate from the injury, and then just get back to it once you're able to."

Stop Overestimating Exercise Benefits

"You can't out-train a bad diet" isn't just a saying—it's science. Mark learned this through countless failed attempts at compensating for overeating with exercise.

"I used to fuel my 25-minute park run with a big bowl of sugary cereal. I also used to be too fat despite doing a park run. Coincidence? I don't think so," he reflects. Most gym sessions burn only a few hundred calories—far less than many assume.

"If I do nothing all day, I'll burn a good couple of thousand calories anyway. To burn a couple of thousand calories through exercise—that's a tough training day," Mark explains. A typical 45-minute jog burns around 500 calories, but add a post-run treat, and you're back in surplus.

Be Wary of Social Media Fitness

Mark cautions against following extreme social media trends: "Most people on YouTube or Instagram with any degree of following are committing a level of time and effort to their training that is just far beyond the norm."

"'I inhaled nine pizzas in a row—here's what happened' is a more entertaining video than measuring broccoli," he notes. While these videos can be entertaining, they shouldn't be your blueprint for success.

Use the Scale Wisely

When it comes to weighing yourself, context is everything. "When I was hugely overweight, I needed those weekly weigh-ins to track real progress," Mark explains. However, as he got closer to his goal weight, the scale became less relevant.

"When you are close to an ideal weight, fluctuations day to day in your weight for all sorts of reasons will be beyond your control," he says. For those near their ideal weight, Mark suggests a simpler approach: "Look in the mirror, jump up and down a few times. You'll know if you're on track."

Plan for Success

"If you make everything you want to do as easy as possible to do, you're simply more likely to do it," Mark emphasizes. His solution? Remove all barriers to healthy habits.

"I started prepping all my day's food the night before. I would have space by the front door for my running shoes, and I'd buy loads of running shorts, so I always had a fresh kit," he shares. Even his gym choice prioritizes convenience over premium facilities—choosing one two minutes from home over a better-equipped facility further away.

Create Systems, Not Just Goals

"Eating right, training right, looking after yourself, it just comes down to good habits," Mark insists. "You can have all the goals in the world, but if you don't have the right habits in place, they will just stay as goals forever."

He suggests making healthy choices as accessible as "sweets and candy at the checkout." The easier you make it to do the right thing, the more likely you are to do it consistently.

Handle Critics Wisely

As you transform, expect comments—not all positive. "Are you ill? Are you eating enough? Is everything okay? You're not going to lose any more weight, are you? That can't be healthy," Mark recalls hearing, even from family members.

His advice? "You need to learn to simply smile and ignore a lot of what you hear because there is nothing of value to be gained from listening to people commenting on how you look unless they have been pleasant and positive."

Find Your Fitness Community

"There's huge value in putting yourself in situations where people around you are doing what you are doing," Mark shares. While he initially embraced the lone warrior mentality, he discovered the power of community support.

"It's not about results or achievements, it's about knowing that your mindset of wanting to be better is shared by others," he explains. Whether it's local fun runs, cycling events, or obstacle courses, surrounding yourself with like-minded individuals reinforces your commitment to health.

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Track Progress Beyond the Scale

Mark stresses the importance of multiple progress markers: "From where I am now, and with the experience I have in losing weight to get to wherever I want to be, I know there is nothing the scales can tell me that I can't tell from looking in the mirror and jumping up and down."

He suggests focusing on how you feel, your energy levels, and your performance in activities rather than fixating solely on weight numbers.

The Science Behind Weight Loss: What Research Shows

While Mark's journey provides valuable real-world insights, the Mayo Clinic offers scientific backing to his observations. According to their research, successful weight loss requires both dietary changes and physical activity—but in different proportions for different goals.

"Diet affects weight loss more than physical activity does," the Mayo Clinic reports, validating Mark's observation about not being able to out-train a bad diet. However, they note that "physical activity has a stronger effect in keeping weight from coming back after weight loss," which explains why Mark's long-term success came from combining both elements.

Exercise Guidelines: What Science Recommends

The U.S. Department of Health and Human Services provides specific guidelines that align with Mark's approach:

• 150 minutes of moderate aerobic activity or 75 minutes of vigorous aerobic activity weekly
• Strength training for all major muscle groups at least twice weekly
• For enhanced weight loss benefits, aim for 300 minutes of moderate activity weekly

This scientific framework supports Mark's emphasis on consistent, sustainable activity rather than extreme workout sessions.

The Real Numbers Behind Calorie Burn

For a 160-pound person, one hour of activity burns approximately:

• Running at 5 mph: 606 calories
• Hiking: 438 calories
• Swimming laps: 423 calories
• Low-impact aerobics: 365 calories
• Leisure cycling (<10 mph): 292 calories

These numbers from the Mayo Clinic support Mark's warning about overestimating exercise calories. As he noted, even a solid workout burns far fewer calories than many people assume.

RELATED:8 Tips to Make Losing Weight Feel Effortless, From Proven Experts

The Age Factor in Weight Loss

The Mayo Clinic experts add an important insight about aging and weight loss: "Because of changes to the body over time, you might need to cut calories more as you age to keep losing weight or to stay at the same weight." This scientific finding explains why Mark's approach evolved over his 15-year journey.

Balancing Exercise and Diet: The Research View

An important caution from experts: "Losing weight with diet alone and without physical activity can make people weaker. This is because of age-related losses in bone density and muscle mass." This research validates Mark's holistic approach to fitness, combining proper nutrition with regular exercise.

For optimal results, follow both Mark's practical insights and the scientific guidelines: create sustainable habits, maintain consistent activity levels, and remember that while diet drives initial weight loss, exercise is crucial for maintaining your results long-term. And if you enjoyed this article, take advantage of these 15 Quick Ways to Lose Body Fat Percentage in a Week.

There are lots of weight loss myths circling about that could be preventing you from losing weight. Jillian Michaels is a fitness expert and star of The Biggest Loser. In one of her viral video she debunks four key weight loss myths. “This video is gonna address a bunch of your questions all under one umbrella. That umbrella being weight loss myths. Now, I can't tackle them all. There are so many of them, but I'm gonna tackle some of the more predominant ones,” she says.

Myth 1: Hot Workouts Are More Efficient for Weight Loss

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The first myth she wants to bust? Hot workouts are more efficient for weight loss. “I know a lot of you guys love this. I'm not trying to take this away from you. If you love it, fantastic. But if we're talking about efficiency and fat metabolism, they're far less effective because the room is so hot,” she explains.

Working Out in Cooler Environments Make You “More Metabolic”

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She explains that “there is a lot of research that shows us a cooler, colder, ambient temperature, makes us more metabolic,” and activates fat in a way that helps you burn more overall fat. “Hot workouts not only don't burn more fat, but in fact they make your workout far less effective because you are stressing the body from the outside in, which can fatigue us. Meaning we engage in less physical exertion where you want that heat to come from the inside out via physical activity and physical exertion.”

The More Hydrated You Are, the More You Will Detox

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She also explains that “the better hydrated you are, the better those organs can do their job of detoxifying you. So dehydration is also counterintuitive to fat metabolism, detoxification, hydration and cooler temperatures are going to be far more effective.”

Myth 2: Fasted Cardio Burns More Fat

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There are lots of weight loss myths circling about that could be preventing you from losing weight. Jillian Michaels is a fitness expert and star of The Biggest Loser. In one of her viral video she debunks four key weight loss myths. “This video is gonna address a bunch of your questions all under one umbrella. That umbrella being weight loss myths. Now, I can't tackle them all. There are so many of them, but I'm gonna tackle some of the more predominant ones,” she says.

Here Are the Workouts That Burn the Most Calories

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She adds that “the fitness techniques that burn more fat are not actually steady state cardio at all,” and instead are resistance training, HIIT training, plyometric training, all of which “burns more calories, more calories when you're doing it, more calories when the workouts are over,” she explains. “Burning fat is a matter of burning through energy stored in the fat cells, so we wanna use more overall energy. We just do, period.”

Myth 3: Carbs and Fat Make You Fat”

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Her next on the “myths and fallacies” list? “That carbs make us fat. Fat makes us fat. This isn't true,” she says. “Now, it is well known that processed junk food can make us fat because it leads to overeating. It has no nutrient content. And yes, it can throw off your biochemistry, your metabolism because it's releasing a ton of insulin and just screwing up your metabolism, which is connected to, in large part, based upon your hormone balance. So these foods throw your hormone balance out of whack.”

Instead, Eating in a Calorie Surplus Makes You Fat

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“Overall calories determine your weight. And as I've said, many times, health and weight don't inherently intersect. We want them to,” she says. For example, an avocado has lots of healthy fat, “micronutrients, the vitamins in the minerals, it's really healthy food. It's also a calorie dense food, an energy rich food. If you eat too many avocados, no matter how many nutrients they have, you'll store the excess energy in them as fat,” she points out.

Avoid Diets But Cut Out Processed Foods

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“The ultimate goal of weight loss, having nothing to do with counting macros, having nothing to do with going carb free, having nothing to do with cutting out fats,” she says. “Do I want you eating great quality food? Of course I do. I want you to cut out the processed flour, those refined grains, the white sugar.”

Myth 4: Food Timing

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Lastly she tackles food timing. “I'm sure you guys have heard, ‘Don't eat at night. Don't eat in the morning. Eat small meals all day. Eat one meal a day. OMAD fast.’ It just, it doesn't stop, right? Food timing and weight loss, it's not connected. It isn't, it's not connected.”

She Eats for 12 Hours and Fasts for 12

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The only way timing is really related to weight loss is “if you skip meals,” she says. “It can cause overeating. So the food timing impacts your calorie consumption. That is the only relation, the only one to food timing really.” She herself eats every three and a half hours, usually fasting for 12.