The goal of this observational study is to compare the impact of eccentric resistance training to traditional resistance training on fatigue in persons with multiple sclerosis (MS). The primary question this study is asking is the following: is eccentric resistance training more fatiguing than traditional resistance training in persons with MS?. Participants will be asked to come for two sessions for two weeks. In the first week, subjects will undergo a bout of either traditional or eccentric resistance training. The next day they will return to assess their level of fatigue. The following week the subject will return and undergo whatever type of training they did not experience the first week, and it's effects on fatigue will again be assessed. The difference between the subjects level of fatigue for either condition will be compared.