Using a treadmill is a good way to get aerobic exercise, but there a few rules of the road you'll want to follow to use it safely.
"On those days when you can't walk or run outside due to heat, cold, or rain, treadmill exercise can offer the same benefits plus the added benefit of being able to add hill-specific workouts and pacing strategies," advises Chris Eschbach, PhD, director of the Human Performance Laboratory at Meredith College in Raleigh, N.C.
