The Cyclus2 is the ideal ergometer and an excellent device for performance diagnostics and training. For that purpose the ergometer can be stowed away nicely and easily in a special, compact transport case and be transported safely e.g. in a car or aeroplane. The assembly of the Cyclus2 is very straight forward and done in a few minutes without the use of any tools. The Cyclus2 does not necessarily require an external power supply during an ergometry and can be operated independent from mains power. A practicable mains power independent operation can be provided by an optionally available rechargeable battery.