When you think of jump rope, perhaps it brings to mind breezy summer nights, girls in pigtails and a borrowed clothesline. But in fact, jumping rope has some very adult-sized benefits -- it's an effective way to burn fat, increase stamina, improve coordination and firm muscles, especially your shoulders, arms and legs. It's a speedy calorie burner too: Jumping at a moderate speed of 70 to120 turns per minute for 15 minutes burns 150 to 200 calories -- as much as running a ten minute mile, but with half the impact on your knees and ankles.

Jump ropes are completely affordable and transportable. Prices range from $5 to $25, and since a rope can easily be tucked into a purse or suitcase, it's easy to take yours on the road. All you need is enough ceiling height and room to turn the rope without knocking over a lamp or whipping your cat's paws. Choose a jump rope that's made of plastic or plastic beads. Cloth ropes are too flimsy and leather ropes take a long time to break in. Soft foam handles and a swivel-like turning action will make the rope more comfortable to use. Also keep in mind that jump ropes are not one-size-fits-all. To make sure yours is the proper length, stand on the center of the rope with one foot and pull the rope straight up along the side of your body. It's a perfect fit if the handles reach to your armpit. The Workout

• Jumping can take some practice. Although you are using your entire body, you'll especially feel it working your lower arms and lower legs. At first these muscles may tire or even cramp. But they should gain more endurance after a few weeks of jumping at least twice a week.