I joined a gym about 4 months ago. I've had 3 kids and I wanted to lose weight and regain muscle tone. I received an intro session with a trainer when I joined the gym. He told me to modify my diet (which I did) and do cardio (which I've been doing) and he also showed me some arm and leg exercises. I've been doing everything exactly the way he told me to and I'm really unhappy with the results. I'm thin now but flabby (if that makes any sense). I lost all the weight but now I'm almost too thin. I want to be toned, not skinny, and I'm not sure what to change. I eat about 1800 calories a day, run 3 days a week and strength train once or twice a week. I'm 5'0 and 97 pounds. I'm very petite and small boned. I don't want to bulk up I just want to look fit and healthy. What should I change to achieve that?