Days before their second weigh in, all six challengers returned to Northwestern Memorial Hospital in Chicago for another battery of tests with Dr. Martha Gulati.
"This group is amazing. … They're a cardiologist's dream as a group," Dr. Gulati says. "They've lost weight, their blood pressure's gotten better, their cholesterol's gotten better. If all of my patients would do what I say—eat right, exercise—this would be amazing. You guys were great."