Find a local hill or set a treadmill to an incline of at least six. Run 30 seconds hard, at eight to nine, on a scale of one ...

The obvious reason to incorporate speed training into your runs is to get faster. Doing the same moderate run every week is ...

you may be wondering whether it's better to run longer or faster. There's nothing quite like a relaxed, long run with a good playlist. But shorter, high-intensity sprints can really work up a sweat.