If you're looking to improve your running strategy, tweak your training, or are just curious, knowing how many steps there are in a marathon can be a valuable fitness metric. As it can vary based on ...

How many calories you burn when you run a mile depends on factors including your weight, age, fitness level, and more. Find out how you can increase that number.

From pricey wearable devices to your phone, it has never been easier to track your daily physical activity, or lack of it. And if you're like many Americans and spend nine-plus hours sitting every day ...