STEVIE GRAND / SCIENCE PHOTO LIBRARY STEVIE GRAND / SCIENCE PHOTO LIBRARY
Treadmill exercise. Time-exposure image of legs jogging on a treadmill in a gymnasium. This aerobic exercise (encompassing jogging and running) helps improve the performance of the cardio-respiratory (heart and lung) system. Performed regularly, it can raise fitness levels, and when medically supervised it can increase the stamina and endurance of heart patients.
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