If you have bad joints, using an elliptical trainer will spare them when you exercise. If you want to stimulate muscle and bone strength through impact, walking would be better.
Heart Health
Elliptical trainers and treadmills provide a good workout for your heart and lungs. They're not very different in that regard.
Reduced Impact
Elliptical trainers are intended to spare you the impact of running. If you have bad hips or knees from arthritis or injuries, you will probably prefer to use these machines.
Overweight People
People who are overweight or obese might also be better off using elliptical trainers. Impact forces are higher the heavier you are. They increase your chances for injury when you are performing repetitive motions such as walking.
Impact and Bone Density
Impact stimulates your bone to become denser to better absorb shock. This helps prevent demineralization and weak bones as you age.
Impact and Your Muscles
Not only do your bones become stronger through impact, your muscles become better able to stabilize your joints. This is another way your body becomes better at absorbing shock.
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