"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." MY LEGS WERE screaming, my lungs were on fire, and the incline ahead had me stressed. I was in mile two ...

It's that time of year again, when runners are forced to take their routes indoors. Avoid treadmill boredom this winter with Outside Interactive's Virtual Runner app. This is Google Maps for runners.

When unfavorable weather—be it rain, extreme heat, or snow—complicates outdoor running, treadmills offer a controlled and reliable option. Even if you have time constraints or just seek the ...