A national sample of volunteer fire departments will be recruited for a 6 month, CRCT with a cross-over treatment design to determine the efficacy of The First Twenty (TF20), a wellness program focused on nutrition and fitness for firefighters. Modifications to the existing TF20 will be made to enhance the health coaching features and include tools for program evaluation. Study outcomes (changes in weight, BMI, body fat percentage, waist circumference, dietary intakes, blood pressure, and fitness activities) will be assessed pre- and post-intervention.