When cold, dark, rainy, or icy conditions make it tough to get outside, the obvious option is to hit the treadmill. The good news: Doing speed workouts on the treadmill makes the time seem to fly by ...
If you think 20 minutes isn’t enough time to get in a good workout—you’re wrong! Though 20 minutes might not seem like a big commitment, or even like it won’t lead to many benefits, it’s just enough ...