Inclusion Criteria:  Must had been prescribed pedalling exercise as treatment for lower limb rehabilitation caused by stroke, traumatic brain injury, neuro-motor disorders, and neuro-degenerative diseases. Must be able to perform a pedalling session with virtual reality technology.  Exclusion Criteria:  An insufficient cognitive state, in particular, presence of dementia or mild cognitive impairment. An unbound bone fracture. Severe disorders of vision and/or audition (inability to perceive visual and/or auditory information coming from virtual reality) Those whose clinical record ruled out any incompatibility with the use of a virtual reality system.