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 ...
High-intensity interval training, or HIIT, is a great way to torch calories, boost your metabolism and get a great workout in a shorter amount of time. And if you're a fan of hopping on the treadmill ...
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