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Where does the inertial originate?

The idea linked to inertial training was born in the second half of the Eighties as a solution to muscle atrophy and the decrease in bone density to which astronauts were subjected during their missions. What made most classical exercises inapplicable was the weightlessness to which scientists in orbit were exposed.

In 1994 two Swedish scholars, Tesch and Berg, created the first prototypes of isoinertial machine. Since then, numerous manufacturers around the world have developed these technologies.

Spacewheel, through its Dynamic and Infinity lines, has tried to create a new product, different from everything that the inertial world had already known.

Throughout the design phase, the key word was versatility. Unlike everything that the market offered before the advent of Spacewheel, this type of training was limited by the lack of adaptability of the products to the needs of 'terrestrial' athletes.

Through a different and efficient construction system, Spacewheel has made it possible to work at 180 ° with respect to the support surface, making any exercise feasible, for any sport.




In Spacewheel isoinertial machines, resistance is generated by a mass set in rotation. This mass is represented by the flywheel which, rotating on itself, rolls the rope fixed to the shaft.

Each time a repetition unwinds the string, inertia rotates the flywheel and rewinds the string.

The term isoinertial is so defined because the athlete (or patient) works against the force of inertia generated by their movement.

An exercise isoinertial takes place in continuous acceleration / deceleration, alternating eccentric and concentric phases.   The properties of the platform allow to emphasize not only the concentric phase of the exercise, as with the use of isotonic loads, but also and above all the eccentric phase, also called the load resistance phase.

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The data collected on the isoinertial was proof that it is a type of preparation (albeit little known to most) that is essential for any athlete.

Spacewheel inertial training guarantees:


  • Better affinity of muscle activation with sports performance;

  • Better expression of strength than free weights;

  • Possibility to modulate the muscular effort;

  • Premature hypertrophy;

  • Ability to move from the verticality of the movement;

  • Reduced overloads on the back compared to traditional methods;

  • "Free" movement, unconstrained as in traditional isotonic machines;

  • Easy transport, small footprint;

  • Job feedback via software.


In isoinertial work, resistance is variable in every instant: at any moment you can decide how to characterize the training and this depends on the speed and strength we exercise.


In addition to sports practice with SpaceWheel it is possible to integrate isoinertial training in the rehabilitation field. This technology, which makes it possible to develop high peaks of force both during concentric and (and above all) eccentric contraction, is a useful tool for injury prevention and functional re-education. The use of SpaceWheel allows to obtain early structural (muscular hypertrophy) and neuromuscular adaptations compared to a traditional

training with overloads.

Scientific research shows how this technology can be successfully applied, for example, in functional recovery after reconstruction of ACL (anterior cruciate ligament of the knee), or in the case of patellar tendinopathies or, more generally, in the presence of muscle-tendon pathologies. generated by muscle imbalances.

The versatility of the system allows SpaceWheel:


  • perform a movement not bound to planes or axes of rotation, to favor functional control and stabilization of the movement;

  • gradually plan the rehabilitation process to bring the patient closer to the specific gesture in total safety;

  • manage the load using the four available flywheels individually or in combination: size XS, S, M and L;

  • modulate muscular effort to train maximum power or emphasize executive speed;

  • with the software package, monitor the workloads and the powers expressed through the app provided on a dedicated tablet.


The tangible demonstration of these arguments is represented by the attribution of  CE medical certification to all our isoinertial products.


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