Every January or more accurately each new month, gyms are full of people chasing fitness objectives, expecting this time things will be different- gain muscle, lose weight, or just feel healthier. With that increase in motivation follows a new wave of that seemingly limitless "fit-buddy" tips that is typically contradictory to the established facts that fills up fitness culture. Perhaps you've heard that treadmill running is better for your knees than pavement running. Or that stretching before each and every workout is absolutely essential if you don't want to get hurt. These claims sound convincing, but many of them don’t hold up to scientific scrutiny.The fitness industry has a long tradition of handing down rules of thumb without ever stopping to wonder where they came from. But exercise physiology and sports medicine science has a very different tale to tell. Elliott Morgan, host of the Mental Floss YouTube channel, breaks down and debunks 10 common workout myths in his video, “Misconceptions About Exercise.” To train smarter not harder it's worth distinguishing fact from fiction. Let’s break down ten of the most common workout myths, and what the evidence really shows.Myth 1: Treadmill Running Is Easy on the KneesIt's tempting to think treadmills are easier on the knees due to their cushioned belts, but studies tell a different story. Runners tend to shorten their stride when running indoors, bouncing and over-striding in ways that end up putting more stress on the joints. Outdoor running isn't necessarily worse—the most important things are technique, shoes, and slowly increasing distance to prevent overuse injuries.Myth 2: Change Running Shoes Every Six MonthsNo six-month magic. The shoe life cycle is determined by your body weight, running technique, mileage, and type of shoe. Some runners wear out as many as 600 miles or more in one pair. Rather than using the calendar, listen to comfort, cushioning, and overt wear. Your body will typically indicate it's time to change.Myth 3: Stretching Averts InjuriesStatic stretching prior to exercise does not decrease injury risk—instead, it temporarily weakens muscles. According to a 2013 Journal of Strength and Conditioning Research study, static stretching decreased muscle power by approximately 2%. That is not an invitation to omit warming up. Dynamic stretches and low-intensity movement-based drills are more effective methods of getting muscles ready for activity without blunting performance.Myth 4: If You're Not Sweating, You're Not Working HardSweat is your body's means of cooling itself down, not a literal indicator of effort. Heredity, water intake, and surroundings all affect how much you sweat. Someone can burn serious calories with a low-sweat activity such as weightlifting or yoga, while another person sweats buckets on a brisk walk. Effort, not sweating, is what matters.Myth 5: Sweating Flushes Out ToxinsThe notion that sweat cleanses your body has persisted, but it's inaccurate. Sweat consists primarily of water and electrolytes, with trace toxins making up only 1% of the constituents. Detoxification's heavy lifting occurs in your liver, kidneys, and digestive system. Saunas and hot yoga can be invigorating but are not a replacement for the body's natural detox processes.Myth 6: Calorie Counters on Machines Are AccurateThe figure flashing before you on the treadmill isn't scripture. Machines tend to overestimate burn rates since they can't correct for body composition, age, sex, or effort. Ellipticals especially can overestimate calorie counts by more than 40%. Treadmills are closer to reality, particularly when you plug in your weight. But to be absolutely accurate, wearable heart-rate monitors and metabolic tests are much better.Myth 7: Sit-Ups Alone Will Give You a Six-PackSit-ups and crunches are core exercises that build strength but won't miraculously burn belly fat. Spot reduction, losing weight in a specific targeted area, has been debunked time and again. Visible abs depend on a combination of strength training, cardio, and a well-balanced diet to cut down overall body fat. A six-pack is as much about nutrition as it is about a gazillion sit-ups.Myth 8: Cardio Always Burns More Calories Than Strength TrainingCardio may burn more calories while you're actually doing the exercise, but strength training has a strong after-effect. Due to excess post-exercise oxygen consumption (EPOC), weight lifting increases metabolism for several hours after you're done at the gym. In reality, a program that includes a mix of cardio and resistance training usually gives the best fat loss, performance, and long-term health results.Myth 9: Maximum Heart Rate = 220 – AgeThis equation is a common usage but infrequently accurate. It tends to overestimate heart rate zones for younger individuals and underestimates heart rate zones for older individuals. The American Council on Exercise stresses there's no such thing as the ultimate one-size-fits-all formula. If you need precision, laboratory testing or consulting with a coach gives way more useful numbers than a straightforward subtraction formula.Myth 10: No Pain, No GainThe catchphrase has motivational appeal, but pain is not the objective. Some soreness and discomfort are okay, but sharp or ongoing pain is a red flag for injury. Specialists emphasize listening to your body: it's possible to build strength by pushing through exhaustion, but pushing through actual pain can lead to long-term harm. Rest is equally essential to making progress.Why Its Important To Rethink Fitness Advice?Myths about exercise linger because they're memorable, simple to repeat, and in some cases based on half-truths. But holding on to them can hold us back—resulting in wasted effort, frustration, or even injury. The true intention isn't to train harder for the sake of it, but to train smarter.Science shows us that fitness isn’t about rigid rules, it’s about adapting to your body’s needs, training consistently, and pairing exercise with good nutrition and rest. Whether you’re running, lifting, or doing yoga, the most effective routine is the one that balances effort with evidence.Disclaimer: This article is for informational purposes only and should not be taken as medical advice. Always consult a qualified healthcare or fitness professional before making changes to your exercise routine, diet, or lifestyle. Individual results may vary.