You want to look great in your "skinny jeans" and every diet you've tried has failed. And you're getting nothing out of those irregular trips to the gym. So what should you do? Put one foot in front of the other.

Walking is the most effective way to shape your rear, develop toned calves and get slimmer thighs. It costs nothing, is easy, and, best of all, you already know how to do it. Walking isn't fancy. All you need is a good pair of shoes; no special gym or equipment required. Best of all, speed-walking burns almost as many calories as jogging -- but without damaging your joints. Lace up!

Here's how to get the most out of your walk:

Practice good form. Walk tall, relax your shoulders and bend your elbows at 90-degree angles. Land on your heels and roll through your foot, pushing off firmly with your toes, for maximum calf-toning benefit.

Alternate speeds. Start slow, then gradually increase your pace to a brisk walk -- one that makes it tough to carry a conversation. Alternate from fast to slow, working up to two minutes fast and one minute slow. Use stop signs or park benches to signal a change of pace. The longer you keep a quicker pace, the harder your muscles work and the more calories you’ll burn.

Go uphill. Adding a climb to your walk also increases the number of calories burned -- and tones your rear, too. Try walking the stairs at a local park or stadium bleachers, or a hilly spot in your neighborhood. If you’re walking on a treadmill, select the interval training option with an incline.

Sneak in your workout. If you don’t have time in the morning, incorporate several shorter walks into your day. Take the stairs at work instead of the elevator, or leave your desk for a brisk lunchtime walk around the building. Do errands on foot instead of driving. Hoof it to the neighbors' house for a chat.