Inclusion Criteria:  Age group: Older adults between the age group > 55 years old with MOCA less than 26 out of 30 will be classified as mild cognitive impairment and those above 26 out of 30 as cognitively intact older adults . Absence of any acute or chronic neurological (Stroke, Parkinson's disease, Alzheimer's disease), cardiopulmonary, musculoskeletal, or systemic diagnosis. No recent major surgery (< 6 months) or hospitalization (< 3 months) Not on any sedative drugs Can understand and communicate in English Ability to walk more than 10 meters without an assistive device  Exclusion Criteria:  Participants will not proceed with the study if any of the following occurs at baseline measurement: 1) HR > 85% of age-predicted maximal heart rate (HRmax) (HRmax = 220 - age), 2) systolic blood pressure (SBP) > 165 mmHg and/or diastolic blood pressure (DBP) > 110 mmHg during resting), and/or 3) oxygen saturation (measured by pulse oximeter) during resting < 90%. History of bone fracture or significant other systemic disease or surgery in the last six months Specific to MRI participants: Self-reported presence of a pacemaker, metal implants other than orthopedic implants, and/or Claustrophobia, cataract surgery (lens not compatible to the MRI confirmed by the MRI technician) Weighs > 220 lbs (Harness weight threshold)