
Losing muscle mass is an uncommon goal, as most people want to build muscle. However, some people want to lose muscle for aesthetic reasons or to improve their performance in sports. To lose muscle, it is recommended to shift focus from muscle-building activities to other healthy activities, such as cardiovascular exercises, and to eat a healthy diet with a reduced calorie intake. It is important to note that directly attempting to lose muscle mass is not recommended for the general population, and it is best to consult a healthcare professional before starting a muscle loss plan.
How to Shrink a Muscle
| Characteristics | Values |
|---|---|
| Recommended Activities | Cardiovascular exercises, swimming, hiking, biking, softball, soccer, jogging, tennis |
| Recommended Training Style | High-rep sets (80-100 reps per set), light weights, bodyweight exercises |
| Recommended Diet | Low-calorie, low-protein, low-fat, fruits, vegetables, whole grains, legumes, nuts, seeds |
| Not Recommended | Weight training, strength training, high-protein diet |
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What You'll Learn

Reduce calories and protein intake
Reducing calorie and protein intake is a key component of shrinking muscles. While it is unconventional, some people seek to lose muscle mass for aesthetic reasons or to improve their performance in sports.
To shrink muscles, it is important to eat a healthy diet of varied fruits and vegetables, whole grains, low-fat dairy, fish, lean meats, legumes, nuts, and seeds. The US Dietary Guidelines recommend between 1,600 and 2,400 calories per day for adult women and 2,000 to 3,000 per day for adult men. However, it is crucial not to reduce calorie intake below a healthy amount. To lose weight and shrink muscles, it is recommended to cut 500 calories per day, which can result in losing up to one pound per week. Eating less protein will also contribute to muscle loss, as protein supports muscle growth and retention. By not consuming protein immediately after a workout, the body will consume its own muscle tissue for recovery, aiding in muscle reduction.
In addition to diet adjustments, increasing cardiovascular exercise and reducing strength training will contribute to muscle loss. Running, for example, can help shrink muscles, especially in the legs. Excessive running can lead to muscle breakdown, and it is important to be cautious and consult a healthcare professional before starting any muscle loss plan.
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Focus on endurance training
To shrink a muscle, it is important to shift the focus from muscle-building activities to other healthy activities that can help limit muscle gain. While directly attempting to lose muscle mass is not recommended for the general population, you can focus on not building new muscle by reducing your strength training and focusing on endurance exercises.
Muscular endurance refers to a muscle's ability to work over a period of time. It involves lower resistance but higher repetitions, focusing on the muscle's ability to continue working for an extended period. For example, a marathon runner relies on muscle endurance to maintain their pace over long distances.
To improve muscular endurance, you can increase the number of repetitions (reps) you perform during an exercise. For instance, if you normally bench press for 3 sets of 8–10 reps with 155 lbs, you can switch to 4 sets of 15–25 reps at 100 lbs. As your muscular endurance improves, you can gradually increase the weight while maintaining the same number of reps.
You can also increase muscular endurance by decreasing the rest period between sets. For example, if you usually squat for 3 sets of 6–8 reps with 150 lbs and a 120-second rest, you can change to 4 sets of 15–25 reps at 90 lbs with a 45-second rest.
There are various exercises that can help improve muscular endurance. Some examples include:
- Wall sits: Sit against a wall with knees at a 90-degree angle and hold the position for as long as possible.
- Isometric contractions: Kneel on all fours and place your forearms on the ground. Step back with one leg at a time until you're in a straight line from head to heel, keeping your spine neutral. Engage your abs to support your lower back.
- Push-ups: A classic exercise that enhances upper-body endurance, targeting the chest, shoulders, and triceps.
- Indoor rowing: A total-body workout targeting 86% of your muscles in each stroke, building both strength and endurance.
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Do more cardio
While it is unconventional, some people may want to lose muscle mass to achieve a particular appearance or improve athletic performance. If you are one of those people, you can consider doing more cardio.
Doing cardio exercises can help you lose muscle mass because they increase the number of capillaries in your muscles, which enhances the transportation of oxygen, nutrients, and hormones to your muscles. Cardio also improves insulin sensitivity, which increases the levels of carbohydrates and amino acids taken up by your muscles. However, doing too much cardio can lead to muscle loss instead of fat loss. Therefore, it is important to balance your cardio workouts with other forms of exercise and ensure you are getting adequate rest.
The type of cardio you do matters. Low-intensity cardio exercises, such as light walks and bike rides at a leisurely pace, are ideal for maintaining muscle mass. On the other hand, high-intensity exercises, such as sprinting or high-intensity interval training (HIIT), can help maintain or even increase muscle mass. If you are looking to lose muscle mass, avoid these high-intensity forms of cardio.
To lose muscle mass, you should also consider decreasing your caloric intake. Eating too few calories can slow muscle growth, but it is important to maintain a healthy diet and not go below the recommended daily intake. The US Dietary Guidelines recommend between 1,600 and 2,400 calories per day for adult women and 2,000 to 3,000 calories per day for adult men.
In addition to doing more cardio, you can also shift your focus from muscle-building activities to other healthy pursuits. Instead of heavy lifting, try bodyweight or light weight-bearing activities. Remember, directly attempting to lose muscle mass is not recommended for the general population. Consult with your healthcare provider to determine if a muscle loss plan is right for you.
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Lift lighter weights
Lifting lighter weights can be an effective method for building muscle. Research has shown that lifting lighter weights can offer results comparable to lifting heavier weights. Lifting lighter weights can also provide several advantages.
When using lighter weights, the targeted muscles are able to manage the load independently, without relying on other muscles to assist in the movement. This results in more hypertrophic gains in the desired muscles. For example, during a triceps pressdown, if the weight is too heavy, the larger shoulder muscles will overpower the triceps, leading to the shoulders doing most of the work.
Lifting lighter weights also ensures that your muscles are doing all the work, rather than relying on momentum to lift the weight. This means that your muscles are stimulated to grow, and you avoid the risk of injury from lifting weights that are too heavy for your body to support.
Additionally, lifting lighter weights allows for a full range of motion, which leads to better performance and more significant muscle growth and strength. Lifting lighter weights can also be beneficial for beginners, as it boosts their confidence as they witness improvements in their strength and endurance.
It is important to note that the classification of "lighter weight" is subjective and will vary depending on individual fitness levels and goals. It is recommended to consult with a healthcare professional or a personal trainer to determine the appropriate weight and routine for your specific needs and goals.
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Detrain fast-twitch muscle fibres
To detrain fast-twitch muscle fibres, you must understand what they are, how they are built, and how they are lost.
Fast-twitch muscle fibres, also known as type II muscle fibres, are responsible for quick, explosive movements and rapid reflexes. They are essential for athletes who require speed and power, such as sprinters and weightlifters. These fibres can be further classified into type IIa and type IIx, which are abundant in power athletes, and type IIb, which are used for short bursts of power.
To build these fast-twitch muscle fibres, athletes often engage in high-intensity exercises such as lifting heavy weights with low repetitions, plyometrics, sprint intervals, and Olympic lifts. These exercises put stress on the muscles, forcing them to adapt and grow stronger.
However, if your goal is to detrain or reduce the development of these fast-twitch muscle fibres, you should avoid the aforementioned exercises and focus on the following strategies:
- Decrease the amount of resistance used while weight lifting. The American Council on Exercise recommends using lighter resistance for 3 to 6 sets of 12 to 16 repetitions of each exercise for muscle endurance instead of muscle hypertrophy.
- Focus on bodyweight or lightweight-bearing activities instead of heavy lifts.
- Increase your cardiovascular exercises and decrease your strength training sessions. Cardiovascular exercises help maintain health and burn calories without directly adding to your muscle mass.
- Adjust your diet by reducing your protein and carbohydrate intake. Eating enough calories to fuel your activity and maintain your weight, but not in excess, can help avoid creating the ideal conditions for muscle growth.
- Consult with your primary care physician to determine if a muscle loss plan is suitable for you and to ensure a safe and healthy approach.
By implementing these strategies, you can effectively detrain and reduce the development of your fast-twitch muscle fibres.
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Frequently asked questions
While it is unconventional, some people do want to lose muscle mass to achieve a particular appearance. If you want to shrink your muscles, it is recommended that you shift your focus from muscle-building activities to other healthy activities to limit muscle gain. You can do this by focusing on cardiovascular exercises instead of strength training, decreasing your caloric intake, and lifting lighter weights.
To shrink your muscles, you can do bodyweight or light weight-bearing activities instead of heavy lifts. You can also try to do very high rep sets (upwards of 80 to 100 reps per set) with light weights.
The United States Department of Agriculture recommends that adults aged 18 to 64 get 2.5 hours of cardiovascular exercise per week. However, for faster results, you can do cardio for 45 to 60 minutes six times a week.
To shrink your muscles, you should reduce your protein intake and eat enough calories to fuel your activity and maintain your weight, but not an excess.
Yes, directly attempting to lose muscle mass is not recommended for the general population as it can be unhealthy. It is important to work with your healthcare provider to determine if a muscle loss plan is right for you and to ensure you are following a healthy diet and exercise regimen.











































