Objectives: 1) To determine the role of timing in rehabilitation of balance deficits in people with mTBI 2) To determine if home monitoring improves outcomes 3) To develop a novel feedback system using wearable sensors to provide physical therapists with real-time information about quality of head and trunk movement during exercise. Plan: This is an interventional study on people with mTBI. Aim I examines whether initiating interventional physical therapy earlier rather than later improves outcomes. Aim II, nested within Aim I, examines whether home monitoring of vestibular rehabilitation improves outcomes. Aim III develops a system capable of delivering real-time feedback on quality to improve outcomes.