Helen Esposito is fighting back against obesity. The 25-year-old didn't want to go down the same path as her dad.
"I lost my father to diabetes and heart disease. I just felt if I didn't do something right away that I was heading down a very dark path."
51-year-old Sharon Williams also knew she had to change her lifestyle.
"This was too much weight to be carrying for this long."
Recent research shows the number of people who need to lose at least 100 pounds is the fastest-growing group of overweight Americans with a growing list of health problems.
"You have hypertension, you have diabetes, you have people with knee problems and orthopedic problems."
James LaMar runs Obesity Boot Camp in Westbury New York.
Using tire flips, exercise bands and calisthenics - he pushes his clients' limits.
"Tires and ropes they actually help to elevate your heart rate many people here aren't able to do all the running."@
Programs like this one are helping many people get back to a healthy weight and a healthy life.
The class meets five days a week. members also see a nutritionist and keep a food journal.
"I cut out mostly fast foods.. I had been eating a lot of that."
Track Helen lost 40 pounds in just 3 months.
"It's an amazing feeling to know you have lost that much weight."
Sharon also took off 40 pounds.
"I want to live longer. I want to just be a better, healthier me."
The challenge now is to keep up this new way of living for the rest of their lives.