The purpose of this study was to explore how families would respond to a health-related, home-centered family fitness program designed to improve lifestyle exercise and eating behaviors. This program involved five families (eleven subjects) recruited from Park Road High School in Rural Virginia. The program was based on family systems theory, and social learning principles. The program consisted of a one-week baseline period and five two-week intervention periods. A changing criterion design was utilized; and incentives ($15 toward active sports equipment) were offered during the final two phases if all family members met their food goals for both weeks of the given phase. The entire group was tested regarding personal health measures (flexibility, resting heart rate, resting blood pressure, height, weight, and body composition); strength (bent knee sit-ups, modified pull-ups); knowledge (written test); and cardiovascular endurance (one mile or 1/2 mile run/walk) at baseline at the six week point (interim) of the intervention, and at the ten week point (final). / Master of Science