Flywheel training offers unrestrained resistance through the entire concentric action and allows for short periods of eccentric force exceeding concentric force, otherwise known as eccentric overload. The flywheel does this by harnessing the inertia of a spinning flywheel and accelerating and decelerating the flywheel at speed instead of generating resistance by moving a weight against gravity like with traditional training.

This is significant as it generates tremendous force and allows athletes to train with constant resistance in both the concentric and eccentric phases. Inertial and eccentric training through the flywheel method is scientifically supported to produce impressive results in strength training and injury management, such as increased strength, muscle power, hypertrophy, and muscle type conversion.

It is essential to note that concentric contractions determine eccentric contractions and play a more significant role in the concentric phase than traditional constant resistance training. Traditional resistance training puts considerable energy into decelerating the bar in a maximal contraction.

Conversely, the whole concentric phase is propulsive with ballistic movements. Flywheel resistance training has similar kinematics to ballistic exercises because if someone were to perform the concentric phase maximally throughout the entire movement, most of the concentric phase would be considered propulsive, which boosts sporting performance and other mechanical advantages.

Isolated eccentric actions produce higher peak force, lower muscle activation and metabolic cost, higher solicitation of Type IIx fibers, increased cross-education effect, and greater cortical activity.

In addition, despite producing high muscle damage and soreness levels after the initial stretch, eccentric-based resistance exercises result in effective muscle damage prevention mechanisms, faster increases in muscle mass compared to concentric exercises, and improved jumping performance. Hence, eccentric actions can optimize the efficiency of training.

Isoinertial devices were first designed by Berg & Tesch to combat the effects of microgravity on skeletal muscle. By resisting the inertial force softly during the first third of the eccentric action, followed by applying maximal effort to stop the movement at the end of the range of motion, you can produce an eccentric overload.

Results suggest that eccentric overload training employing flywheel technology leads to gains of 5-13% in muscle mass, 11-39% in maximal voluntary contractions, 12-25% in 1 repetition maximum, 21-90% in eccentric force, 10-33% in muscle power, 6-15% in jump ability, 2-10% in running speed and up to 35% in electromyography activity.

Studies have found strong effects towards higher gains after flywheel training compared to other methodologies regarding force, muscle power, hypertrophy, jump ability, and speed. Traditional concentric-eccentric resistance exercises at maximal intensity underload the eccentric phase by about 40-50%.

Eccentric overload force and torque produced during flywheel exercises are roughly 25% higher than concentric for both men and women. Furthermore, data has suggested that high movement and lower inertia during flywheel training induce greater force gains.

The eccentric overload produced during flywheel training is undoubtedly more significant in athletes experienced with using flywheels, highlighting the importance of proper technique to maximize the benefits of this training.

Many users have reported feeling less soreness the day after flywheel training. Studies on flywheel muscle soreness have found that subjects with patellar tendinopathy found traditional resistance strength training and flywheel resistance training similar in pain and function across 12 weeks.

Establishing flywheel resistance training as a viable exercise option for those with patellar tenadinopathy. Furthermore, another study on stroke patients found that subjects did not complain of muscle soreness or fatigue during their high-intensity eccentric overload flywheel resistance training programme.

The lack of soreness after flywheel training can be explained by eccentric overload at short muscle lengths, while most muscle damage and soreness generally happen at long muscle lengths. This means that you can resistance train and eccentrically overload the muscle at short muscle lengths without getting sore.

You can do eccentric training without a spotter using special equipment such as the Exerfly. Using the eccentric motor or manipulating the exercise allows an eccentric overload without the dangerously heavy loads where you need a spotter.
Exerfly's motorized option uses innovative electric motor technology to provide more energy to the flywheel in the eccentric phase of a movement, based on how much energy the user produces in the concentric phase rep-by-rep.

For example, if the Eccentric Overload Boost is set to 10%, the flywheel will be given 10% more energy in the eccentric phase of a movement than it had in the concentric phase. This makes the flywheel spin faster, and the user will get an increased eccentric overload, which is then reflected in the statistics of the Exerfly app.

Exerfly's motorized technology is ideal for achieving and measuring high levels of eccentric overload. The eccentric overload is typically only possible using assistance via the hands of a partner or with a delayed braking action following the full range of motion during the concentric phase.

However, these two methods do not allow you to select and quantify how much you will eccentrically overload. With Exerfly's motorized technology, high loads of eccentric force are easily achievable and managed safely and measurably.

The eccentric overload requires no help or spotters, with the option of supramaximal if needed. This is why Exerfly's motorized technology is widely used by elite sports teams, athletes, and strength trainers worldwide. It has been successfully implemented in sports that require fast, explosive, and powerful movements.

A systematic review on flywheel training found that resistance training is quintessential for improving or maintaining the quality of life because it mitigates progressive age-related impairments such as muscle atrophy and decreased strength. In elderly females, flywheel programmes can improve quality of life measures and life capacity and reduce the risk of falls.

Another study on older adults found that eccentric overload training significantly benefitted older adults' training programmes.

With flywheel training, achieving eccentric overload increases strength and power, mitigates age-related adaptations and generally improves the quality of life in older adults. While studies about older adults are limited, flywheel training features several important muscle, performance, and clinical adaptations.

Variable resistance devices are particularly beneficial because they allow users to work with a force load that matches their output throughout the workout. The resistance increases as they train harder and decreases as they get weaker.

Your body is naturally stronger at specific parts of a lift, so using variable resistance during your workouts allows you to challenge portions of the lift more than others. When we refer to variable resistance using a flywheel, it only gives back eccentrically the effort used concentrically.

So, if you go 100%, every rep from rep #1 is maximal. Whereas with traditional barbell training, it is only maximal effort during the last rep or 2 when you fail.

Flywheel training can be used to optimize your strength training by using the flywheel’s resistance rather than gravity itself. One of the main advantages of this is that there is no limit to the amount of energy produced through flywheel training, which can push you to unimaginable heights.

Furthermore, the flywheel responds to the amount of force you put into it, adapting to your output rep-by-rep. Exerfly can be used for various training, whether strength and conditioning, maintenance, or rehab, and for people of all ages and fitness levels.

One of the differences between flywheel resistance training and traditional resistance training is that with the flywheel, the concentric effort and forces are relatively high throughout the motion.

In contrast, with traditional resistance training, you need to overcome the inertia of the loaded bar and accelerate the bar, which establishes momentum, which needs to be decelerated at some time during the lift.

Elliot et al. (1989) found that only 48.3% of the concentric phase was spent accelerating a bench press load of 81% 1RM. On the other hand, with flywheel resistance training, you are overloaded more throughout the entire concentric phase, which provides significant advantages to the full range of motion force capability.

A substantial advantage of flywheel training is that the physics behind the flywheel's power enables more consistent force applications with approximately % of 1RM during the range of motion throughout the whole exercise.

A common misconception is that cable machines provide a similar overload to the flywheel. Firstly, flywheels can be picked up and taken anywhere. In exercises such as lateral shoulder raises, dumbbells provide minimal overload at long muscle lengths and provide maximal overload at the shortest muscle length. In contrast, flywheels can provide overload at long muscle lengths.

Gravitational dead spots are the zone where the effects of gravity are minimal on the load and involved muscles. With dumbbell lateral shoulder training, there are gravitational dead spots when the arm is parallel to the line of gravity.

Only when the load is perpendicular to the line of gravity will your muscles experience the full overload the dumbbell can produce. With flywheel training, there are no gravitational dead sports as it does not rely on gravity to provide overload, which is why they are used to maintain the strength of astronauts in space.

With flywheel training, users can control how much resistance is experienced throughout their repetitions. By contrast, traditional weights limit the momentum felt on users' joints as this is dependent on the direction of movement relative to gravity and where the weight is positioned.

Variable resistance has been shown to have a positive effect on performance. Studies have found variable resistance training to be an effective evidence-based method of improving maximal strength in athletes with different sports backgrounds and untrained subjects.

Flywheel training offers many advantages over traditional training, with variable resistance being a significant factor. There is no limit to the kinetic energy you can generate with Exerfly equipment.

If you plateau, you can use the motorized technology to boost the eccentric phase. Therefore, our equipment is suitable for all types of training- heavy strength training to rehabilitation- and users of different backgrounds and abilities. The more inertia added to Exerfly equipment, the more force can be produced by the user, which you can record via the app.

With Exerfly, you can perform resistance training at any load or velocity as a simple and effective way of overloading the muscle-tendon-skeletal system to increase power production efficiency.

An effective tool for muscle injury and rehabilitation, Exerfly implements flywheel training, scientifically supported to reduce the risk of injury or re-injury, preserve joint health, and aid in injury management and rehabilitation.

You will not be overloaded or overworked with Exerfly, as a single red flywheel weighs 5kg (10lbs) and is solely managed by the user's output. With Exerfly, coaches can train their players to produce a lot more force at speed, maintain their base level of strength and work on explosive movements while keeping injury-free.

They won't have to endure slow 300kg/700 lbs deadlifts for significant muscle gains, which can create higher chances for injuries.

After match activations, e.g., studies on using flywheel training after match and the science behind it.

Because resistance is based on the input force of the athlete, Exerfly equipment can adapt to suit any skill level. From physiotherapy and rehabilitation to commercial gyms to high-performing sports teams and elite athletes, Exerfly caters to every athlete, young and old, regardless of their journey.
Using the inertia of flywheels, the resistance provided is variable based on the speed and effort of the user, but the load is constant throughout the whole movement. This leads to increases in strength, size, and power through isometric and eccentric overloading methods.

With an all-new app and in-built sensor tracking data points at 4,000 times per second, now you can monitor your workout data in an easier, more efficient way and receive feedback on every single rep.

Track statistics such as force, power, speed, and torque, and watch your performance improve with quantifiable data that allows you to maximize your training and results.