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Flexing your muscles does burn calories, and this type of exercise is called isometrics. However, the actual effect is minimal compared to other forms of exercise. For example, thirty minutes of Hatha yoga, which is heavily based on isometrics, burns about 150 calories for a person weighing 155 pounds. In comparison, running at 5 mph for 30 minutes at the same weight burns about 300 calories. While flexing may not be the most efficient way to burn calories, it can still build muscle strength and improve the mind-muscle connection.
| Characteristics | Values |
|---|---|
| Does flexing muscle burn calories? | Yes |
| Name of this type of exercise | Isometrics |
| Is flexing enough for significant weight loss? | No |
| Suggested ways to lose weight | Reduced-calorie diet, regular aerobic activity, strength-training exercises |
| Examples of strength-training exercises | Isometrics, weight training, calisthenics, pushups, pull-ups, squats, crunches |
| Is flexing a muscle good for building muscle? | Yes |
| Suggested ways to build muscle | Increase the duration of the set, increase the number of sets, perform more often |
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What You'll Learn
Flexing burns calories but is not a weight-loss strategy
Flexing your muscles does burn some calories, and this type of exercise is called isometrics. However, isometrics alone are not sufficient for significant weight loss. While it is true that any muscle movement trains the muscle and burns calories, the impact is minimal without resistance. For instance, thirty minutes of Hatha yoga, which is heavily based on isometrics, burns about 150 calories for a person weighing 155 pounds. Losing a single pound of fat, which is approximately 3,500 calories, would require almost two dozen yoga sessions.
Although flexing does burn calories, it is not an efficient calorie-burning activity. There are more effective ways to burn calories through various cardiovascular activities such as running, swimming, bicycling, karate, jumping rope, and playing racquetball. For instance, a 155-pound person burns about 300 calories in half an hour of running at 5 mph, or roughly 370 calories at 6 mph. The same amount of weight can be lost by swimming the crawl stroke for 30 minutes, burning about 400 calories.
Flexing can be beneficial for building muscle strength, especially for untrained individuals. It can also help improve the mind-muscle connection, making it easier to isolate and train specific muscles during weight training. However, regular lifters may not experience the same gains in muscle size as those who are new to training.
If your goal is to lose weight, a multi-pronged approach is recommended. This includes a reduced-calorie diet, regular aerobic activity, and strength training exercises such as weight training, calisthenics, or body-weight exercises like push-ups, pull-ups, squats, and crunches. While flexing can be a part of your overall fitness routine, it should not be relied upon as a primary strategy for weight loss.
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Isometrics: a type of exercise involving flexing
Flexing your muscles does burn some calories, and this type of exercise is called isometrics. Isometrics are exercises that involve holding the body in one position without any joint movement. The muscles are contracted but do not change length. For example, when you hold a plank, you are contracting the muscles in your core, legs, and upper body to hold you up while remaining in the same position.
Isometrics are ideal for people with limited workout space, those recovering from an injury, or anyone needing a change in their fitness routine. They can be added to rehabilitation programs as they can add tension to the muscles without joint movement. For instance, a basic shoulder bridge can strengthen your spinal muscles and open up your hip flexors.
However, isometrics alone are not enough to cause significant weight loss. If you want to shed fat, you should combine isometrics with a reduced-calorie diet, regular aerobic activity, and strength training exercises.
Thirty minutes of Hatha yoga, which is heavily based on isometrics, burns roughly 150 calories if you weigh 155 pounds. While this may not be the most efficient way to burn calories, every little bit helps, and "Shape" magazine recommends flexing muscles at your desk for five minutes each hour to boost daily calorie burn.
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Flexing builds muscle strength
A study has shown that flexing can build muscle. The study took healthy young adults over 12 weeks, performing 10 x 4-second isometric contractions of the arm with 4 seconds of muscle relaxation for five total sets three times per week. After 12 weeks, the size of the biceps and triceps increased by 4%. Another study found that flexing the bicep and tricep muscles simultaneously and then slowly performing the curling motion increased bicep strength by 5.8% after six weeks.
While flexing at long muscle lengths is better for building muscle, isometric flexing at short muscle lengths still leads to muscle growth. It is not the intensity of the flex that enhances muscle growth, but rather the volume. The duration of the set and the number of sets performed will lead to more significant muscle growth. For example, 4 x 30-second isometric contractions will result in more muscle growth than 4 x (10 x 3 seconds) of contractions, even though the volume is equated.
Flexing can also help improve the mind-muscle connection. Thinking about doing reps and squeezing the muscle during an exercise can double the muscle growth. By flexing the muscle, you can isolate it and improve your ability to train that muscle in isolation with weights.
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Flexing improves the mind-muscle connection
Flexing your muscles does burn some calories, and this type of exercise is called isometrics. However, isometrics alone are not sufficient for significant weight loss.
Flexing can also help strengthen your mind-muscle connection. The mind-muscle connection is a method used by trainers and weight lifters for maximum strength and muscle gain. It involves an athlete consciously and deliberately creating a muscle contraction. It is like having a direct line from your brain to your biceps or any other muscle you are working on.
To improve your mind-muscle connection, you must be able to focus your attention on a specific muscle or muscle region to make it contract. You can start by turning away from the mirror when performing exercises and thinking about how the muscles feel rather than how the exercise looks. Think about your muscles as they go through a range of motions to help activate and strengthen your mind-muscle connection.
Breathing can also impact your mind-muscle connection. By controlling your breath, you can improve your focus and stabilize your core, which helps you maintain proper form and better engage the target muscle. Breathe in through your nose and out through your mouth as you lift and lower the weight.
Additionally, it is important to stick to a weight that allows you to perform the exercise with control and proper technique. Lifting too heavy can lead to poor form and reduced focus on the target muscle.
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Other efficient calorie-burning activities
While flexing muscles does burn some calories, it is not an efficient calorie-burning activity. For maximum calorie burning, it is recommended to engage in aerobic exercises most days of the week. Running is a good choice; a 155-pound person burns about 300 calories in 30 minutes at 5 mph, or roughly 370 calories at 6 mph.
Swimming
Swimming is a full-body cardio workout that puts less wear and tear on your joints. The buoyancy of the water reduces the strain your weight places on your body. Water also offers resistance to every movement, which provides additional muscle-building benefits compared to other cardio exercises. For a 155-pound person, swimming the crawl stroke for 30 minutes burns about 400 calories. Casual swimming for 30 minutes burns a similar number of calories as 30 minutes of jogging but with less stress on the body.
Bicycling
High-intensity cycling is a vigorous cardio workout that can burn a significant number of calories in 30 minutes. Start with a five-minute warm-up and alternate between one-minute speed and two-minute recovery intervals. Bicycling faster than 10 miles per hour burns the most calories in 30 minutes, with an average 150-pound person burning about 287 calories.
Jumping Rope
Jumping rope increases your heart rate and burns calories while building lower leg strength.
Dancing
Dancing is a fun way to raise your heart rate and burn calories. Dance workouts such as Zumba or Bokwa are high-energy and can be done at home.
Jumping Jacks
Jumping jacks are a basic cardio exercise that raises your heart rate and offers a full-body workout. They can be easily incorporated into your warm-up, HIIT workout, or general routine.
High-Intensity Interval Training (HIIT)
HIIT methods can burn a lot of calories in 30 minutes or less. High-knee running, butt kicks, and mountain climbers are examples of vigorous cardio workouts that strengthen your lower body while raising your heart rate.
Climbing Stairs
Research has found that climbing stairs uses nearly eight to ten times the calories you burn at rest. Taking the stairs instead of using an elevator or escalator can easily add this calorie-burning exercise to your daily routine. For a more intense workout, try climbing multiple flights of stairs or adding weights.
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Frequently asked questions
Yes, flexing your muscles does burn some calories. This type of exercise is called isometrics. However, isometrics alone are not enough to cause significant weight loss.
Calories are energy, so anything that uses energy can burn calories. When you flex your muscles, you cause them to tighten to create a bulky or lean appearance.
Yoga poses are a form of isometrics as your muscles are flexed while you hold still. Another example is an isometric chest press, which involves clasping your hands together in front of you and pushing your palms together to flex your chest muscles.
