Burn subjects:  Inclusion Criteria:  ≥10 - ≤80 %TBSA Burn depth: 2nd deep / 3rd degree  Exclusion Criteria:  Electrical burn (except flash burns) Associated injury: fracture lower limb Diabetes Mellitus type 1 Central / peripheral neurological/neuromuscular disorders (interfering with exercise) Cognitive / psychological disorders (interfering with cooperation) Cardiopulmonary disease (interfering with exercise safety) Pregnancy Palliative care  Healthy subjects:  none