Each participant will engage in 60 minute in-person daily sessions delivered 3 times/week for 8 consecutive weeks (a total of 24 sessions). Participants were provided with option to participate remotely due to COVID-19 pandemic.

Participants will be fitted with a heart rate monitor and will be instructed to walk (or trot) to maintain 55-64% of maximal heart rate (determined by exercise test) for the first 4-weeks of exercise or to maintain 65-90% of maximal heart rate (determined by exercise test) for the second 4-weeks of exercise during each session. Participants are provided the option to participate remotely due to COVID-19 pandemic, as detailed below. Both options are designed to be equivalent in intervention and outcome measures.

Option A: Current, IRB-approved, in-person methods pending appropriateness based on current University of Miami recommendations and standard operating procedures as it relates to the COVID-19 pandemic.

Option B: Remote option of current methods to maximize recruitment. This will be the only option until the study team obtains approval to resume Option A (as per University's safety guidelines).

Index of the duration of the Theta-burst stimulation (TBS)-induced modulation of corticospinal excitability. This outcome measure refers to the identification of the time point (T5, T10, T15, T20 and T30). at which the normalized motor evoked potential (MEP) amplitude returns to baseline values (T0 or Baseline). This measure will be in Minutes Post Theta-Burst stimulation. This is a neurophysiological measure, and no group-based norms apply.

Cognitive performance will be assessed using the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) a neuropsychological test battery in executive function, processing speed, learning, and language. It is made up of a series of twelve subtests that take approximately 30 minutes. For each of these, a lower number correct is indicative of a higher cognitive deficit. Subtests are their scales are: RBANS Semantic Fluency (0-unlimited), RBANS Picture Naming (0-10), RBANS List Learning (0-40), RBANS List Recall (0-10), RBANS Story Memory (0-24), RBANS Story Recall (0-12), RBANS List Recognition (0-20), RBANS Digit Span (0-16), RBANS Figure Recall (0-20), RBANS Coding (0-89), RBANS Figure Copy (0-20), RBANS Line Orientation (0-20).

Cognitive performance will be assessed using a neuropsychological test battery in executive function, processing speed, learning, and language. The D-KEFS Verbal Fluency Test measures the ability to generate words fluently in an effortful phonemic format (letter fluency),from overlearned concepts (category fluency), and simultaneously shifting between overlearned concepts (category switching). Raw scores (correct responses, correct number of switches between categories) are converted to scaled scores with a mean of 10 and a standard deviation of 3. Higher scores reflect higher verbal fluency, and an increase in score pre-post would indicate improvement.

Blood samples will be collected to measure: brain-derived neurotrophic factor (BDNF) levels (measured as pg/mL).

Each participant will engage in 60 minute in-person daily sessions delivered 3 times/week for 8 consecutive weeks (a total of 24 sessions).

Aerobic Exercise in person: Participants will be fitted with a heart rate monitor and will be instructed to walk (or trot) to maintain 55-64% of maximal heart rate (determined by exercise test) for the first 4-weeks of exercise or to maintain 65-90% of maximal heart rate (determined by exercise test) for the second 4-weeks of exercise during each session. Two equivalent options provided for participation, to accommodate for COVID-19 pandemic guidelines.

Option A: Current, IRB-approved, in-person methods pending appropriateness based on current University of Miami recommendations and standard operating procedures as it relates to the COVID-19 pandemic.

Option B: Remote option of current methods to maximize recruitment. This will be the only option until the study team obtains approval to resume Option A (as per University's safety guidelines).

Index of the duration of the Theta-burst stimulation (TBS)-induced modulation of corticospinal excitability. This outcome measure refers to the identification of the time point (T5, T10, T15, T20 and T30). at which the normalized motor evoked potential (MEP) amplitude returns to baseline values (T0 or Baseline). This measure will be in Minutes Post Theta-Burst stimulation. This is a neurophysiological measure, and no group-based norms apply.

In 2020, due to challenges posed by the COVID-19 pandemic, social distancing practices, and aiming to create a feasible scenario to continue the study, an additional option was added to safely adapt study methods to deliver a home-based, fully remote program given that the duration of the pandemic was unknown at this time point. The study moved forward utilizing these two options, which were not designed as separate study arms but rather designed to be equivalent.

Each participant will engage in 60 minute in-person daily sessions delivered 3 times/week for 8 consecutive weeks (a total of 24 sessions).

Aerobic Exercise in person: Participants will be fitted with a heart rate monitor and will be instructed to walk (or trot) to maintain 55-64% of maximal heart rate (determined by exercise test) for the first 4-weeks of exercise or to maintain 65-90% of maximal heart rate (determined by exercise test) for the second 4-weeks of exercise during each session. Two equivalent options for in-person and remote participation were offered in response to the COVID-19 pandemic.

Option A: Current, IRB-approved, in-person methods pending appropriateness based on current University of Miami recommendations and standard operating procedures as it relates to the COVID-19 pandemic.

Option B: Remote option of current methods to maximize recruitment. This will be the only option until the study team obtains approval to resume Option A (as per University's safety guidelines, as mentioned above).