Browse evidence-based analysis of health-related claims and assertions
Doing light, steady exercise like walking or slow cycling can help your body use oxygen better during everyday activities and may lower your risk of heart problems over time.
Doing light, steady exercise like brisk walking regularly can significantly boost your heart and lung fitness—even if you're just starting out. That kind of improvement could lower your risk of dying from any cause by over 10%.
When young guys with obesity do intense interval running, they burn more total calories than when they do steady, moderate running—even if the workout burns the same calories—because their bodies keep burning extra calories afterward.
For young guys with obesity, doing short bursts of intense running burns 300 calories faster than jogging steadily — about 8 minutes less effort for the same result.
When young guys with obesity do intense burst running, their bodies burn a bigger share of fat in the hours after the workout compared to when they do steady, moderate jogging—even if both workouts burn the same total calories.
When young guys with obesity do intense burst running, their bodies burn more fat in the half-hour after the workout than when they jog steadily — even if both workouts burn the same number of calories.
When young guys with obesity do a tough workout with short bursts of fast running, their bodies burn more extra calories after the workout than if they jog steadily for the same total energy cost.
If a fit guy burns more carbs during a tough workout, he's likely to burn more fat afterward while recovering.
When fit guys do intense circuit workouts, their bodies burn way more carbs during the workout compared to when they do steady, moderate exercise — like 33 vs 13 carbs per minute for every kilo they weigh.
After tough workouts like HIIT or circuit training, fit guys burn fat faster in the hour after exercise compared to easier, steady workouts—even though they burn less fat during the actual workout.
After tough workouts like sprint intervals or fast-paced circuit training, fit guys burn more carbs in the hour after exercise compared to easier, steady workouts — which might mean their bodies are working harder to refill energy stores.
For fit guys, a tough but short workout leads to burning more calories after exercise compared to a longer, easier workout—even if both burn the same total calories. That’s because intense workouts keep your metabolism revved up longer.
Doing intense bursts of exercise with rest in between can keep your body burning more calories for up to a whole day after your workout.
Doing super intense workouts in short bursts burns more calories in less time than going easy on the exercise.
When you do light, steady exercise like walking, your body burns more fat compared to carbs than when you're going harder, like running.
Doing light, steady exercise—like a brisk walk—can boost the energy powerhouses in your muscles.
Doing light, steady exercise—like a brisk walk or slow jog—for 30 to 60 minutes, where your heart is pumping at 60–70% of its max, helps improve your endurance and how well your body uses oxygen.
This idea says that a smarter math method can help scientists better tell when a workout doesn’t work — not just when they don’t have enough proof either way.
If you keep the resistance the same at different arm angles during cable curls, you can better compare how muscle stretch affects growth, without other forces messing up the results.
If new gym guys do a specific arm curl workout for 10 weeks — going until their muscles are totally tired — their biceps get about 7% to 9% thicker, no matter how their shoulders are positioned, as long as the movement and resistance stay the same.
If you're new to lifting, changing your arm position during cable curls doesn't make one part of your biceps grow more than another — both positions give you the same kind of muscle growth over 10 weeks if everything else is kept equal.
If you do cable curls the same way every time except for where your shoulders are, it doesn’t really matter for building arm muscle—even if you can lift heavier when your arms are stretched out.
If new guys do a specific arm curl workout for 10 weeks — going until their muscles are totally tired — their arm muscles get about 7% to 9% thicker, no matter how their shoulders are positioned, as long as the movement and resistance stay the same.
If you're new to lifting and do cable curls the same way each time, it doesn't really matter whether your arms are stretched far back or in a neutral position — your biceps will grow about the same amount after 10 weeks.