Inclusion Criteria:  DM1 diagnosis must be confirmed by genetic analysis (juvenile, adults or late-onset phenotypes); Aged between 18 and 60 years old; Be able to do exercise; Subjects must be able to give their consent freely and voluntarily.  Exclusion Criteria:  Patients who already train (>3 times per week or >150min/week); Don't speak french or english; Are not able to do exercise (even in sitting position);