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have handle-bars that move back and forth to exercise your shoulders and arms. An excellent aerobic conditioner, some models even simulate uphill and downhill cycling, although they usually cost more.
Look for smooth pedaling and a comfortable seat. "Saddle soreness will turn a bike into a dust collector," says George Lesmes, Ph.D., director of the Human Performance Laboratory at Northeastern Illinois University. Also, look for solid construction and an easy-to-adjust workload.
Treadmills
These machines closely duplicate regular running and, by increasing the incline, you can boost your workouts to higher aerobic levels. The self-activated models (where your movement pushes the belt) can produce more strain and potential for injury, so look for motorized versions.
Look for one with an easy-to-adjust speed and incline, plus a wide and long running surface that is shock
absorbing. High-powered models will handle heavy loads and high speeds better, but should have a slow minimum speed for safe starts. Full-length handrails are nice.
Stair climbers
These allow you to achieve strenuous workouts, raising your blood pressure and heart rate quickly. Dual-action models work your arms along with your legs. Machines which have independently moving steps give a better workout, as opposed to machines with "linked" steps (where one step goes down as the other step goes up.) Look for large pedals and smooth-stepping action. This equipment works your calf muscles better than actual stair climbing. Although the workout is less strenuous on the knees, persons with knee problems should be cautious and consult a doctor before investing.
Cross-country machines
These machines simulate cross-country skiing and work the most muscle groups for an excellent all-around workout. While it may take some practice to coordinate the movements, the exercise puts minimal strain on the body and is easy on the knees.
Shop for equipment with adjustable leg and arm resistance, smooth action, and a base length that accommodates your stride. Equipment that uses cords instead of poles provides you with a more strenuous workout of the upper body.
With the use of stretching, walking while working up to a jog, and gym machines, it is possible to achieve body perfection and peer envioty.