Exercise has been shown to improve quality of life in people with multiple sclerosis but most exercise programmes are carried out at low to moderate intensities. The next stage in the management of the condition is to establish if people with mild Multiple Sclerosis can exercise, safely and effectively at a higher intensity. High intensity interval training (HIIT) involves repeated bursts of hard exercise interspersed with periods of rest. High intensity interval trainingcould be a time efficient and safe option for people with Multiple Sclerosis. Potential improvements are; cardiovascular fitness, resistance to fatigue, balance, quality of life and attitude to physical exercise.