"When we surveyed trainers and asked if their clients felt that exercising more or eating a healthier, balanced diet was more challenging, three quarters of them said diet," says Cedric Bryant, Ph.D., chief science officer for American Council on Exercise. No wonder more professional fitness education organizations (including ACE) are creating specialized certifications to provide trainers with nutrition and behavioral modification know-how so they can help their clients reach their goals. If you'd rather use your trainer for diet advice than seek out a registered dietitian, ask if she or he has any type of certification, or search for a certified health coach or weight management specialist in your area.