Objectives: 1. Test the effect of reducing sedentary behaviour early after stroke on functional mobility and global disability outcomes. 2. Determine the impact of neuroimaging biomarkers (e.g. leukoaraiosis) on response to rehabilitation. 3. Explore the predictive value of accelerometry as an adjunct to the subjective modified Rankin Scale (mRS) to assess functional disability after stroke. Experimental approach/Research Plan/Use of Funds: The investigators aim to recruit 50 participants within 1 week of ischemic stroke onset, aged ≥ 18 years, medically stable as deemed by their physicians, able to walk at least 5 meters with/without gait aid and with ongoing walking or balance goals. Demographic and stroke characteristics, including stroke risk factors, infarct location and volume, leukoaraiosis on routine MRI, and acute stroke treatments (e.g., thrombectomy) will be determined and documented. A battery of impairment, psychosocial, and functional measures, including the mRS and Timed-Up and Go test (primary outcomes) will be completed. Subsequently, participants will be set up to wear activPAL accelerometer, validated in stroke, for 1 week. Following randomization, a sedentary behaviour change intervention will span 6 weeks, with final follow-up assessments at 90 days.