Inclusion Criteria:  Children with neuromuscular disease or cerebral palsy who have gait disturbance or no gait. Children between 3 and 11 years of age.  Exclusion Criteria:  Weight> 35 kg Femoral length (from the axis of the hip joint in the sagittal plane to the axis of the knee joint in the same plane) <23 cm or >38 cm for size M and from 31 cm to 40 cm for size L Stem length (from the axis of the knee joint in the sagittal plane to the axis of the ankle joint in the same plane) <23 or >32 cm for size M and from or >39 cm for size L Distance between great trochanters <24 or >35 cm for size M and <25 cm or >35 cm for size L Inability to understand simple commands, to cooperate actively in therapy, or inability to express basic needs Spasticity measured with the Modified Ashworth Scale greater than or equal to 3 in the lower limbs Scoliosis > 25° without the possibility of wearing a brace Skin alteration where direct contact between the patient's skin and the exoskeleton is not recommended Limitation of passive range of motion at the knee or hip joint > 20 degrees Osteoporosis that may induce a bone fracture when low intensity physical activity is performed Any other medical condition that may be a risk to the patient's safety and well-being in relation to low intensity physical exercise