Rachael has been hired by Mane, a fitness company, to see if their new fitness program is an effective method of reducing weight. She recruits 500 overweight people between the ages of 45 to 60 years old and splits them into 2 groups at random. Group A consists of people who take part in Mane's fitness program for 5 hours a week, while group B consists of people who will undertake cardio and weight training 5 times a week. Both groups are instructed to maintain a balanced diet during the course of the experiment. After 3 months, Rachael finds that group A members have lost 10 percent of body fat, while group B members have lost 3 percent of body fat. Identify the target population.