Training in poor air-quality can have long term performance and health implications. Learn how to adjust your running for different AQI levels!

Will courses designed to be 'flat and fast' or net-downhill really result in an 'easy ultra' or marathon?

Badwater 135 Running in the heat is no fun. You already know that. Runs that feel twice as hard at half the pace, and leave you wondering if it gets better, and what you'll do if your race is this hot. If you don't have a hot race on the calendar, you mostly don't need to do anything deliberate about the heat, just let your body adapt — and there's a decent chance it's worth the misery. But if you've got a hot race coming, heat training is one of the few training levers for runners that can...