
It is a common misconception that building muscle reduces flexibility. In fact, strength training, when performed correctly, can improve flexibility. This is because building muscle allows more fibres to sit in the same space, and since each fibre has the same flexibility potential as the original fibres, the muscle can be stretched further. This is believed to be a protective mechanism to prevent muscle tears. For example, one study found that six months of resistance training in elderly men increased flexibility in an intensity-dependent manner. However, it is important to note that flexibility training through stretching is still important to return the muscle to its original length after exercise and improve circulation to aid in recovery.
| Characteristics | Values |
|---|---|
| Effect of muscle training on flexibility | Resistance training when performed through a full range of motion improves flexibility |
| Effect of muscle training on muscle growth | Resistance training results in a certain degree of muscle growth, allowing more fibers to sit in the same space |
| Effect of muscle training on injury prevention | Strength training is superior to flexibility training for injury prevention as it improves flexibility and strength simultaneously |
| Effect of muscle training on stretch potential | Strength training increases stretch potential by changing the structure of the actual muscle |
| Effect of muscle training on stretch tolerance | Static stretching improves flexibility by increasing stretch tolerance and decreasing pain associated with reaching a specific muscle length |
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What You'll Learn

Resistance training increases flexibility
Resistance training, also known as strength training or weight training, is a form of exercise that uses resistance to build muscle strength and endurance. It involves working the muscles against a weight or force, such as free weights, weight machines, resistance bands, or body weight. This type of training has been shown to offer various physical and mental health benefits, including increased flexibility.
Contrary to common belief, resistance training does not reduce flexibility. In fact, when performed correctly through a full range of motion, it can effectively increase flexibility. This may seem surprising, especially since it is normal to experience muscle soreness and "tightness" a day or two after training. However, this discomfort is only temporary and is caused by acute muscle damage.
Several studies have demonstrated the positive impact of resistance training on flexibility. For example, one study found that six months of resistance training in elderly men led to significant flexibility gains at various joints. The results indicated that training with different intensities, ranging from 40% to 80% of one repetition maximum, increased flexibility by 3-12%, 6-22%, and 8-28%, respectively. Additionally, the same study found that exercise order matters, with agonist/antagonist training and alternating upper and lower body exercises resulting in more considerable flexibility improvements.
Another study compared the effects of resistance training and static stretching on hamstring flexibility. Interestingly, both methods increased flexibility to the same degree. This finding highlights that resistance training can be just as effective as traditional stretching techniques in improving flexibility. Furthermore, combining resistance training with static stretching may optimize results for those seeking significant flexibility gains.
The mechanism behind the improved flexibility from resistance training differs from that of static stretching. Static stretching enhances flexibility by increasing stretch tolerance and reducing pain associated with reaching a specific muscle length. On the other hand, resistance training increases the stretch potential by altering the muscle's structure, allowing it to be stretched further. This structural change is believed to be a protective mechanism developed by the body to prevent muscle tears.
In conclusion, resistance training, when executed through a full range of motion, is a potent method for increasing flexibility. It offers a means to simultaneously build strength and improve flexibility, thereby enhancing overall fitness, performance, and injury prevention. For optimal results, it is essential to vary the training volume, intensity, and exercise order, as well as incorporate other forms of flexibility training, such as static stretching.
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Strength training improves flexibility
Strength training is an effective way to improve flexibility. While the traditional belief is that strength training reduces flexibility, this notion has been debunked by numerous studies. Research has shown that strength training is just as effective as static and dynamic stretching for improving flexibility. In fact, strength training can lead to greater improvements in flexibility compared to stretching alone.
Strength training increases flexibility by changing the structure of the muscle. This allows for a greater range of motion without increasing the risk of injury. The increased muscle strength also helps to prevent injuries by providing more stability around joints. For example, a deep squat can lengthen the muscles in the lower limbs, improving flexibility in the legs, while lifting weights can increase the range of motion in the spine and shoulders.
The key to improving flexibility through strength training is to work through a full range of motion. This means performing exercises with a complete movement range, such as squats or bench presses, without loading too much weight that restricts your normal range of motion. By training through a full range of motion, you can improve flexibility and strength simultaneously.
The benefits of strength training for flexibility have been observed in various populations, including young and older adults, men and women, and individuals with different levels of training experience. For instance, a study on elderly men found that six months of resistance training increased flexibility in an intensity-dependent manner, with flexibility gains ranging from 3-12%, 6-22%, and 8-28% at various joints. Similarly, another study on young sedentary women showed that eight weeks of strength training led to significant improvements in flexibility and strength compared to a control group.
In conclusion, strength training is a time-efficient and effective method for improving flexibility. By working through a full range of motion, individuals can enhance their flexibility and strength simultaneously, leading to improved physical performance, quality of life, and injury prevention.
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Flexibility training prevents injuries
Flexibility training is an integral part of training and preparation for sports. It is defined as the range of motion available in a joint or series of joints. For example, the Sit-and-Reach test, performed according to the American College of Sports Medicine (ACSM) procedures, is a flexibility test for the muscle groups in the hamstrings, hip flexor, quadriceps, and calf.
While the use of stretching to prevent injury, offset muscle soreness, and improve performance has been widely accepted and promoted in sports, there is little scientific evidence to support the practice. Recent research suggests that stretching beyond what is needed for sport-specific movements may cause injury. However, this does not mean that flexibility training is not beneficial or does not have a place in a training program.
Flexibility training, when done consistently, improves flexibility over the long term and can help prevent injuries. For example, a few stretches before and after each workout will, over time, increase your range of movement, make you feel more fluid and relaxed, and reduce your susceptibility to muscle strains and pulls.
Additionally, resistance training, when performed through a full range of motion, can improve flexibility. A study comparing static stretching and strength training found that they increased hamstring flexibility to a similar degree. Another study reported that six months of resistance training in elderly men increased flexibility in an intensity-dependent manner, with flexibility increasing at various joints by 3-12%, 6-22%, and 8-28%, respectively.
Therefore, flexibility training can help prevent injuries by improving flexibility and reducing the risk of muscle strains and pulls. It is important to note that flexibility training should be done consistently and correctly to be effective.
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Static stretching vs strength training
Static stretching and strength training are two different types of exercises that can be performed to improve flexibility and muscle strength. While static stretching involves holding a single position for a period of time, strength training involves resistance training that can help improve flexibility and increase muscle strength.
Static stretching is a type of stretching exercise where an individual holds their muscle in the same elongated position without any movement. It is a slow and controlled movement that focuses on postural awareness and body alignment. The goal is to move the muscle as far as it can go without feeling any pain and then hold that position for 15 to 45 seconds. Static stretching is effective at increasing the range of motion (ROM) and reducing musculotendinous stiffness, which can help prevent acute muscle strain injuries. It is often used as a cool-down routine after a workout to help prevent injury and improve flexibility. However, using static stretching as a warm-up before an athletic competition may negatively impact performance as it can limit the body's ability to react quickly.
On the other hand, strength training involves resistance training that can be performed through a full range of motion to improve flexibility. Resistance training results in muscle growth, allowing more fibres to sit in the same space. This increased muscle flexibility is believed to be a protective mechanism developed by the body to prevent muscle tears. Strength training increases stretch potential by changing the structure of the muscle. Additionally, it improves flexibility and strength simultaneously, making it superior to flexibility training for injury prevention.
While static stretching primarily improves flexibility through increasing stretch tolerance and decreasing pain associated with reaching a specific muscle length, strength training changes the structure of the muscle itself, allowing for greater stretch potential. Both static stretching and strength training can be effective tools for improving flexibility, but they differ in their mechanisms and potential impact on performance.
It is worth noting that the effects of different training volumes on flexibility are still unclear. However, a combination of resistance training and static stretching can optimize results for individuals seeking significant improvements in flexibility.
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Full range of motion increases flexibility
Flexibility is the body's ability to move freely and easily. It is an important aspect of physical fitness and can significantly impact one's quality of life. Having good flexibility can help in performing everyday activities with ease, reducing muscle tension, and enjoying a wide range of physical activities.
The range of motion of a joint is typically measured with devices like a goniometer or inclinometer, which measure the joint's movement in degrees. This can then be compared to accepted normal values. Flexibility can also be measured using functional tests, which assess the joint's range of motion within the context of common movement patterns.
Full-range-of-motion exercises improve flexibility. For example, a study comparing static stretching and strength training found that both methods increased hamstring flexibility to the same degree. Another study on elderly men found that six months of resistance training with different intensities (40%, 60%, and 80% of one repetition maximum) increased flexibility at various joints in an intensity-dependent manner.
Additionally, the order of exercises can also affect flexibility gains. For instance, agonist/antagonist training and alternating upper and lower body exercises result in significant increases in flexibility.
In conclusion, performing exercises through a full range of motion improves flexibility, which in turn enhances physical performance, improves balance and stability, and reduces the risk of injuries.
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Frequently asked questions
Building muscle through strength training does not reduce flexibility. In fact, strength training, when performed through a full range of motion, can improve flexibility.
Resistance training results in a certain degree of muscle growth, which allows more fibres to sit in the same space. Since each fibre within that space has the same flexibility potential as the original fibres, the muscle can be stretched further.
For individuals looking to significantly improve flexibility, a combination of resistance training and static stretching would optimise results.
A good routine might include strength training with tension bands, bodyweight exercises like squats and lunges, donkey kicks, and pilates for hip and core strengthening. It is also beneficial to include 10-15 minutes of yoga as a cool-down.
Flexibility training has many benefits, including helping to correct and prevent muscle imbalances, increasing the range of motion in the joints, relieving stress at certain joints, decreasing the chance of injury, and improving posture.











































