Effects of Walking in Greenspace and the Built Environment in Adults With Prediabetes: A Randomized Crossover Trial

Inclusion Criteria: * 25-64 years old. * Classified as overweight or obese with BMI 20.0-39.9 kg/m2 per self-report and a BMI of 20.0- 41.9 kg/m2 upon actual measure. * Documentation\* of a PreD diagnosis within one year of enrollment by physician or primary care provider based on lab tests showing a fasted blood glucose of 100-125 mg/dL, a 2-hour oral glucose tolerance test of 140-199 mg/dL, or an HbA1c level of 5.7%-6.49%271; OR a study screening lab value of HbA1C within the aforementioned range. * Currently engaged in ≤100 min/week of moderate to vigorous exercise -confirmed via a 7-day activity recall. * No exercise contraindications as assessed by the Physical Activity Readiness Questionnaire (PAR-Q) -this Questionnaire involves seven "yes" or "no" questions regarding an individual's health status. Answering "yes" to any one of these questions may require a prospective participant to acquire a written doctor's note stating they can safely participate in the trial's exercise intervention. The participant would not be enrolled until this doctor's note is received. * Stable weight over the last 3 months (less than 10% change). * Not currently pregnant, planning to become pregnant, or currently breastfeeding. * Willing to maintain current dietary and exercise habits, aside from any changes to be made per the study exercise protocol. * Must own a smartphone and be willing and able to download the Garmin Connect app * Ability to speak and understand English. * Any level of income * Any race/ethnicity Exclusion Criteria: * Individuals \<25 or \>64: younger individuals may have not yet reached physiological maturity and in whom PreD prevalence is low; older individuals are more likely to have contraindications to PA and other comorbidities. * BMI \<20 or ≥42. * Individuals with an HbA1c level \<5.7% or \>6.4%. * Currently engaged in \>100 min/wk of PA. * Individuals with contraindications to exercise participation as indicated by the PAR-Q. * A self-reported physical/mental disability that would prevent them from being able to adhere to the intervention. * Past or current diagnosis of Diabetes (Type 1, 1.5 or 2) or use of diabetic medications (e.g. medications to control blood sugar) * Any history of a cardiovascular disease event (e.g. heart attack, ablation, pacemaker, stroke) * Current treatment for cancer or heart disease (lipid and hypertensive medications acceptable but will be tracked closely). * Any change within the last 3 months, or anticipated changes, of any medications that would affect study outcomes (e.g. medications for lipids, blood pressure, anxiety, depression) * The use of any medication that significantly interferes with the autonomic nervous system * Current tobacco or nicotine users, or those who have quit within the last six months * Excessive alcohol (on average\>1 drinks/day for women and \>2 drinks/day for men) or excessive recreational drug use (reported usage of once a week or more). * Unstable weight over the last three months (\>10% change). * Those with major surgery planned or recent history of bariatric surgery (within last 2 years) or a history of other medical interventions that would interfere with study outcomes * Currently within one-year postpartum, currently pregnant, or planning to become pregnant during the study period. * Currently breastfeeding. * Unwilling to comply with study randomization procedures. * Unwilling to maintain current dietary and exercise habits, aside from any changes to be made per the study exercise protocol. * Current participation in another interventional clinical trial. * Previous randomization in this study.