[sidebar]If you…Struggle with your weight, whether you’re losing it or maintaining a weight loss. You’re an…Easy gainer.What’s going on: “The reasons you battle more with your weight are physiological, metabolic, and genetic,” Dr. Wyatt says.The key to success: “For the best shot at weight loss, you need to increase how much you move,” says Dr. Wyatt. “Essentially, you have to be all in: decreasing calories to lose weight while ramping up the activity to make your metabolism behave.” (Here are 100 Simple Ways To Lose Weight.)    If you…Eat good foods and exercise but aren’t seeing the pounds peel off.You’re a…Healthy overfueler.What’s going on: You’re at energy balance, not working off what you’re taking in. “Eating smart definitely helps maintain weight, but not enough for weight loss. Losing and maintaining are two separate processes. You have to have both strategies and know when to use each,” Dr. Wyatt says.The key to success: “Either cut calories or increase activity,” she advises.    If you…Haven’t had a problem keeping extra weight off until now.You’re a…Midlife gainer.What’s going on: In the past, small changes kept your weight in check, but you can’t do what you used to do. “You were probably losing muscle and gaining fat, but the scale number wasn’t changing, so you didn’t worry about it,” Dr. Wyatt says.The key to success: “Add some strength training to your cardio to help build muscle and keep your metabolism revving on high,” she says. (Get started with thesetotal body toning moves.) More from Prevention: The Metabolism Miracle For Women Over 40