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The following exercises are not quite as aerobic as those above, but still offer solid workouts.

Stair-stepping requires the use of a stair-stepping machine where your legs move in an up-and-down motion, like you're climbing stairs, but without having to take actual steps. It's an ideal alternative to stair-climbing for those with some physical limitations, like tricky knees or low fitness levels, as it places less stress on the body.
As a reminder, always consult your doctor for medical advice and treatment before starting any program.