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Why Does Exercise Start Hurting Two Days After a Workout?

Illustration: Chelsea Beck/GMG If you’ve decided, this year, to start working out, you might have noticed a strange phenomenon: You’ll leave the gym feeling fine, and then two days later wake up sore. This weird time-lag appears unique to exercise, and

Does exercise burn more calories in the cold than in warm weather?

Gut Check is a periodic look at health claims. We ask: Should you believe this? The claim: E xercising in the cold burns more calories than exercising in warmer temperatures, making it easier to lose weight. Specifically, people who hiked in

Does phone radiation give you cancer?

  I can’t count how many times I’ve heard people speculate, joke, or jokingly speculate that their cellphone might be giving them cancer. It comes from a very reasonable place of discomfort — few people understand how radiation works, we put