“…Concussion diagnoses were defined consistent with the most up-to-date international consensus statement on concussion in sports definition during the study period, as were management recommendations provided to patients. 1 Our inclusion criteria consisted of being 10 to 17 years of age at the time of enrollment, having a Post-Concussion Symptom Inventory (PCSI) score of 9 or more at initial visit to ensure participants had not recovered by the time they enrolled in the study, 26,30,[34][35][36] and beginning activity tracking within 18 days of their injury. Exclusion criteria included those who experienced a lower extremity injury concomitant with their concussion that would affect exercise participation, a concussion within the last 6 months (excluding the index injury), a second head impact before clearance from the initial concussion, documented structural brain injury via neuroimaging (if performed), or a highvelocity injury mechanism (eg, a motor vehicle crash that occurred when traveling at a high speed or a fall from height, determined upon clinical intake prior to recruitment).…”