PACE-HD is studying whether participants (with early manifest Huntington’s disease) who commit to the physical activity program, manage to follow up and complete the 12 month intervention. The active intervention group will be supervised and encouraged by a trainer/physiotherapist on a regular basis. The results on both motor and cognitive tests, will be compared with a group of around 60 participants who are only monitored doing their physical activities as usual. The aim of the study is to see if HD patients, when being followed up and encouraged in a specialized program for physical activity, follow the program and benefit from the training.