Why runner's itch happens, how long it usually lasts, what helps, and how to tell it apart from hives, heat rash and the rare reaction that needs emergency care.
Training load, fuel, heat, sleep or something medical? Use the timing of your heavy legs to find the likely cause, a fix for your next run and the warning signs.
Doubles can help experienced runners fit in planned mileage or add it gradually. Start with one easy second run, protect your long run, and make room for meals, rest and sleep.
Cold wind, a clenched jaw, your earbuds or something else? Here are 12 causes of ear pain when you run, what to try for each, and when to see a doctor.
Runner's legs are lean, defined, and durable, not bulky. Here's what running does to your legs, the muscles it works, and a simple workout to build them.