Patients will be randomized into two groups. The first group (experimental group) will be subjected to 12 treatment session (2 sessions/week) on Gait Trainer machine. The second group (control group) will undergo to a conventional treatment with the same duration and frequency of the experimental group. Data will be analysed by means parametric and non-parametric tests. Both, within and between groups comparison will be performed. Data will be analyzed using SPSS software (ver 11.0; SPSS Inc., Chicago, IL, USA). Expected results: we could hypothesize that the training performed by the experimental group could improve gait endurance and daily life disability in patients with MS.