In people with emphysema or chronic bronchitis (known as COPD, or chronic obstructive pulmonary disease), organized physical rehabilitation programs have been shown to improve breathing symptoms and provide other benefits.
The question is, what kind of exercise provides the most benefit?
It turns out that as people develop COPD, their breathing difficulties limit them from moving around, which eventually weakens their leg muscles. This weakening of the legs, in turn, leads to worsening of breathing symptoms.
Studies have shown that isolated lower limb exercises can strengthen the legs and may help improve shortness of breath symptoms and exercise tolerance.
Remember to use caution and talk to your doctor before starting any kind of exercise program.