30 pwMS will be recruited from the Physical Disability Rehabilitation Unit at the Queen Elizabeth University Hospital, Glasgow, and randomised to APT + usual care or usual care only. Those in the APT group will receive 30 minutes of APT (2 mins passive warm up, 26 mins active cycling and 2 mins passive cool down), five days per week for 4 weeks. Outcome measures will be cardiovascular fitness measured using the oxygen uptake efficiency slope (OUES), spasticity assessed by Modified Ashworth Scale (MAS) and the Multiple Sclerosis Spasticity Scale (MSSS-88), function assessed by the Functional Independence Measure (FIM) and the Timed 25 foot walk test (T25FW), Quality of Life measured by MSQOL-54. Outcome measures will be assessed in both groups before and after the 4 week intervention period. Symmetry, distance cycled and power will be recorded following each cycling session in the intervention group.