Population. Participants will be recruited through established programs by expert investigative teams at 4 sites. For Calgary (Alberta Children's Hospital) and Edmonton (Stollery Children's Hospital and Glenrose Rehabilitation Hospital), subjects will be identified via the Alberta Perinatal Stroke Project (APSP); a population-based research cohort of >1000 MRI-confirmed perinatal stroke subjects with a proven track record of recruitment to clinical trials71. Toronto subjects will be recruited from established CP research cohorts at Holland Bloorview Kids Rehabilitation Hospital. All sites have established clinical research programs in childhood CP and experience running relevant interventions including camp-based intensive motor learning programs.