I have fought the good fight, I have finished the race, I have kept the faith. —2 Timothy 4:7 Not many people would disagree that professional football is a rough, sometimes violent sport. Years ago, ...

The prevailing training advice to ‘keep your hard days hard and your easy days easy’ is intended to be simple – but in reality, it can really mess with your head. Most runners understand what ‘easy’ ...

The prevailing training advice to “keep your hard days hard and your easy days easy,” while intended to be simple and straightforward, can really mess with your head. Most runners understand what ...

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Hang around this sport long enough and you’ll eventually find your PRs are in the rear view mirror. For a lot of us, the realization that our performance is declining can be tough to accept. Dr.

One of the big debates in endurance sports these days is about “training intensity distribution,” which is a fancy term for how much of your training time you spend going easy, medium, or hard. The ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. A running habit ...