Alex Hutchinson

The Athlete's Guide to Probiotics

The human body is awash with microbes, inside and out. And scientists are now discovering just how important that is for athletes.

Your Body on Brain Doping

A sharp bang, like a rifle shot, echoes off the walls of the converted warehouse. There's a brief silence, then everyone heads for their bikes, checking to see whose tire has blown.

Supplements: The Good and the Bad

There's scant evidence for the effectiveness of most supplements. But here are a few to consider—and a few to shy away from.

Exhaust Yourself

Fact: Exercising in polluted air can increase your risk of asthma, stroke, and heart failure. But is it better than the alternative—avoiding a workout altogether?

Avoid the Smog

If the EPA’s Air Quality Index measures more than 150—or 100 if you have asthma or other sensitivities—adjust your workout by doing the following.

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