 We will train subjects at home more intensively than in previous studies, to see whether they can cycle useful distances. The effects of this training will be systematically assessed in a Health Study, which will: i regularly monitor cardiopulmonary fitness; ii make regular tissue measurements related to pressure sore susceptibility, and iii measure the effect on bone density. These health measurements will be made at the collaborating clinical centres, i.e. for Glasgow, this will be at the Queen Elizabeth National Spinal Injuries Unit, Southern General Hospital. We will also document the mobile recumbent tricycle system as a design specification, in preparation for commercialisation. 