Since bursting on the fitness scene five years ago, millions of elliptical trainers have been installed in health clubs and homes. Elliptical cross-trainers are the only real breakthrough aerobic product of the past few years," says Gregory Florez, spokesman for the American Council on Exercise (ACE). "They are absolutely not a gimmick."

According to the American Sports Data, Inc., "the elliptical motion trainer, continued to grow in popularity, with 6.2 million users in 2000, up from 2.4 million when first measured in 1997."  Its popularity is surging as an exercise equipment. Elliptical trainers are burning calories, strengthening biceps, substituting as exercise bikes, an experience in aerobics and can even inhibit the onset of osteoporosis.

Elliptical trainers combine the natural stride treadmill and the simplicity of a stair climber. On an Elliptical trainer, you stand comfortably in an upright position while holding onto the machine's handrails and striding in either a forward or reverse motion.

What makes a trainer unique is the ability to offer a weight bearing workout that puts minimal stress on the joints. Your feet never leave the pedals of an elliptical trainer, thereby eliminating any impact in your workout. Whether you go forward or reverse, and regardless of the level of resistance, there is a reduced risk of injury from overusing any one-muscle group. Take care of foot health

Weight bearing exercises like running, hiking and aerobics benefits the body in ways that non-weight bearing exercises like rowing and cycling cannot. Weight resistant workouts builds bone density and burns calories more efficiently.

For individuals trying to burn calories and trim down, the weight-bearing arm/leg exercise optimizes energy expenditure during self-selected exercise of moderate intensity in overweight subjects. In recent studies it was concluded that energy expenditure among overweight subjects was higher on the elliptical machine than a treadmill, or leg cycles with and without upper body motion. For overweight individuals who are initiating a regular exercise program to decrease excess body fat, they will find that elliptical treadmills optimize energy expenditure.

Elliptical Motion

The low impact, intensive cardiovascular workout of an elliptical trainer is achieved through smooth and natural motion. The fluid, non-jarring motion makes the elliptical trainer ideal for anyone with back, knee, hips and joint problems. The dual action machines utilize both the legs and arm in providing a full upper and lower body workout.

Motion studies over the last decade show that the human foot moves through an elliptical pattern as we walk, run or jog. Fitness products that imitate and support this motion are the fastest growing new category of cardiovascular equipment.

With scarce time, a major factor in people's daily lives, total body exercise can be truly beneficial. A total body exercise machine meets three goals that are most desired - weight loss, time efficiency, and motivation.

Total Body Exercise involves more muscle mass in an aerobic exercise activity. For the average person, the larger the muscle mass involved in exercise, the more effective that exercise is for improving fat mobilization, burning calories and building muscle endurance in an efficient period of time, and at a reduced perceived rate of exertion. The upper and lower body workout of a trainer utilizes the quadriceps. hamstrings, glutes, chest, back, triceps and biceps.

Want burning calories, strengthening biceps, the effect of exercise bikes, an experience in aerobics, and a fight against the onset of osteoporosis--try an elliptical trainer.

Elliptical Technology

Within the fitness industry, "Elliptical Technology" has become the generic name for devices that incorporate the various linkages/mechanisms in an effort to create a preferred pattern of movement for a pair of foot pedals. The shape of this preferred movement is intended to mimic the natural path of the ankle, knee and hip joints experience during locomotion - walking, striding, jogging and/or running.

In its most rudimentary form, Elliptical Technology consists of a crank arm (similar to the crank of a bicycle) that revolves around an axis at one end and that is attached to a bar at the other. The opposite end of the bar moves in a reciprocating, linear pattern when the crank rotates. Since one end of the bar rotates in a circular pattern while the other moves linearly, points between the two ends of the bar move in elliptical patterns. The points of the bar closest to the crank move in wider, more circular ellipses (closest to a circle) and the points closest to the other end move in thinner, flatter ellipses (closer to a straight line).