Inclusion Criteria:  Premenopausal adult females over the age of 18 and under the age of 45 with a BMI greater than or equal to 25 and a waist circumference greater than or equal to 35 inches. No medical contraindications to participation in an exercise program including major medical illnesses (i.e. cardiovascular disease, stroke, cancer, etc.) Ability to provide informed consent Willingness and ability to participate in an interval training in-person group fitness exercise program 3x/week for 12 weeks  Exclusion Criteria:  Adults unable to consent or mini-mental score less than 18. Individuals who are not yet adults (infants, children, teenagers) Pregnant women Post-menopausal women Do not speak English Prisoners Subjects on medicines (serum glucose, insulin, weight loss medicines, beta-blockers) and having any medical pre-conditions that would interfere with one's capacity to exercise. Answer "Yes" to any of the questions on the Pre-Activity Screening Questionnaire (PASQ)