Running outside in inclement weather prepares you for races, which don't stop for the weather (save, of course, for extreme weather like thunderstorms, hurricanes, and snowstorms). Running outside regardless of the weather is a healthy and invigorating experience.
Even so, running indoors is reliable, convenient, limits your exposure to outside risks, and can be more sociable if you choose it to be. If there's a school or college nearby that has an indoor track you can use, consider doing so. It's a nice alternative to running on a treadmill at home or at the gym. Be careful, though, as some indoor tracks are shorter than ⅛ of a mile. Short tracks have more turns, which can adversely affect your knees, ankles, and hips.
Look for tracks that are longer than at least ⅛ mile, and check whether it's permissible to change directions halfway through your run, which is better for your legs. Some tracks prefer that everyone run in the same direction.
A treadmill is a good option for indoor running and can be done at home or at a gym or club. There are new indoor treadmills coming to market all the time. The best indoor treadmill is the one that works for you. Experiment with several before you hone in on one, and be receptive to trying new ones that show up in your gym.
How do I determine my miles per hour?
Pace is the number of minutes it takes to travel 1 mile. To determine your pace, divide 60 by your treadmill speed in miles per hour. For example: If your treadmill speed equals 3.5 mph, divide 60 by 3.5. You are covering a mile in 17 minutes.
Running on treadmills is recommended when you have no choice and you don't want to miss a workout. The treadmill's convenience is wonderful, but ultimately it is not the best method to train for long-distance running. Those in training for a marathon still need to do a large percentage of running on roads, particularly with those all-important long runs.
As you run indoors, remember to focus on your form. When you exercise, proper posture and technique are essential to maximizing your effort and avoiding injury. Many runners respect the importance of posture and mechanics when doing outside sports but give little thought to these when exercising indoors on equipment.