So prior to having three little munchkins who always seem to NEED something

, I was this same size for a number of years...and I maintained it with a mix of calorie counting, cardio and strength training at the gym -- a mix of machines, free weights and some "body weight" type exercises like crunches. I spent a good hour at the gym doing the strength training every other day, but I NEVER bulked up. I was just trim and fit looking.
This time during my weight loss, while I wanted to go to the gym, I couldn't figure out how to swing it with my schedule, but I knew that I wanted strength training to be part of my routine. What I did was go buy some resistance bands at a fitness store -- the kind with handles and a door attachment. At first I was skeptical that big rubber bands would do the trick, but I searched the web for some exercise routines using the bands and I read the suggested exercises that came with them...and I started using them as soon as I started my weight loss journey back last summer -- as well as some other "body weight" exercises like leg lifts, lunges, crunches, bicycle crunches and wall push-ups (Now regular push-ups as I am in better shape than I was...). I have to say that the resistance bands work INCREDIBLY well. I would put my body now, at 37 and eight years after my first child was born, up against my former body, in my late twenties, any day (Oh, except my poor boobs...nursing and weight gain has taken a toll there...but resistance training can't do much to fix that problem so I am VERY grateful to Victoria's Secret.

).
This afternoon my sweet husband was kind of leering at me as I got out of the shower following my cardio...and he asked me to flex my back muscles...so I did. He said, and I quote, "Wow, you are so hot." Eloquent, isn't he?

But I am kind of proud of my muscle "tone"--which is really just a way of saying my "girl muscles" cause we don't grow the man version without some seriously insane working out, and I can assure you that I am ABSOLUTELY not "ripped like a man". My arms have "definition" and so do my legs and my abdomen, but it is not bulky. On most women, muscle translates as "lean and sexy"...um, if I do say so myself.
Anyway, this rambling post was my round about way of saying...start now. It doesn't have to be a gym. My strength training isn't in a gym -- but I have also done that too and it works great as well.
Oh, a short illustration...my sister and I are the exact same height and I out-weigh her by around 8 pounds. However, we WEAR the same size and our measurements are identical to within 1/2 an inch, and I get to eat more than she does because my lean muscle mass burns more calories. The difference is that while she is a biker and a runner, she doesn't strength train.
If you do it, you will most likely lose weight more steadily as you ramp up your metabolism, and you will start to "look different" at a higher weight. Besides, it makes you feel great -- strong and full of energy.