Inclusion Criteria:  Between 18-39 years old Sedentary (not meeting 50 minutes of moderate to vigorous physical activity per week) Pass the Physical Activity Readiness (PARQ) questionnaire  Exclusion Criteria:  Have diabetes (self-reported) Have a history of smoking (self-reported) Take medication for weight loss (self-reported) Are pregnant, become pregnant, or are breastfeeding during the study (self-reported) Physical activity >50 minutes of moderate to vigorous physical activity per week Unstable weight during the 6 months prior to commencement of study (>4kg weight loss/gain) Have uncontrolled hypertension blood pressure >160/90 Have a history of heart disease, previous myocardial infarction, or stroke Have participated in a sprint interval training exercise program in the past 6 months Have participated in regular intermittent fasting (≥2 weeks) in the past 6 months Have BMI under 18.5 or over 30